Tag Archives: Visualisations

2.5 Degrees from Ego

The correspondence network of Adriaan Reland (with data taken from Early Modern Letters Online) as a ego network taken to 2.5 degrees

Friday n° 37, June 28th, 2019

The last weeks have been packed with work, so that my last two blog posts had to be cancelled because I had to write chapters, presentations, papers, and other things (all about or issuing from the project, so that has all been working time) and was not able to communicate the state of work here for the time being. As promised, I am now returning to my schedule as the flood begins to sink and I’m no longer fearing to drown any moment, and will from now on again deliver my weekly research stats.

Hooray for data!

And to begin this week’s state of research, let me take the opportunity to advertise the ‘other thing’ I have been working at for the past weeks, which actually is a data set. Thanks to and in collaboration with the ERC Skillnet project I have been able to publish some of the letters I’ve been working as ‘The correspondence of Adriaan Reland’ on Early Modern Letters Online. 212 letters have either survived or can be inferred from those letters which I close-read with certainty, and, sadly, that’s all that is left. The metadata of these letters to and from Reland are now accessible via this collection, so I’d like to invite you all over to have a look at these. The added value of embedding them in a larger context as provided by EMLO of course lays in the possibility to explore the wider interconnections of this parcel of letters within the res publica litterarum of Reland’s time, so I thought, let’s give that a try for today.

A 2 degree Ego network

The 212 Reland letters have been sent to 36 correspondents, not so many in terms of scholarly correspondences, so it seemed a good idea to construct a second degree ego network from this in EMLO terms: I checked all of Reland’s direct correspondents via EMLO for their contacts among each other, to see how densely they were interconnected apart from their shared correspondence with Reland. So what you see in this visualization of the whole network is Adriaan Reland at the centre, highlighted in red, as befits a good ego network, and gathered around him his direct correspondents as green nodes, with the communication to Reland as green arrows also. The thickness of the edges depends on the amount of letters exchanged, whereas the size of the nodes is due to the total number of references to the scholar the node represents in terms of the whole network. Connections between Reland’s direct correspondents drawn from EMLO are visualized by black arrows, the thickness again keyed to the number of letters.

The missing 0.5 degrees…

But first of all there is a lot of blue and grey stuff in this diagram which I have not yet said anything about, and second I promised you a 2.5 degree network in the opening headline. So what about that?

Well, as you suspect already, both things are directly related. To start with the missing 0.5 degrees, this was due to the way in which I collected data on these letters. As my project is all about references to other scholars to track the circulation of information, I went through a part of these letters very closely, trying to identify each person and publication mentioned therein. Now EMLO does not support inclosing information on publications in their metadata on the letters, but they do support inclosing mentions of persons, so this is all in there. And that means these data were there to work with them in drawing up the ego network. So what I wanted to have a look at was if the people mentioned to Reland’s direct correspondents would line up with the rest of the network – that is, the contemporary people mentioned. That would give an indication as to whether this is something like an 18th century communication bubble and thus might provide a way to reconstruct missing epistolary evidence. All of these mentions I took to constitute a triad between a) the person who mentions a name, b) the person who is mentioned, and c) the person this name is mentioned to, and all of these relations are visualized in grey within this diagram, as they quite literally are somewhat shady in terms of ‘real’ network edges.

Click the image for a full view of the visualization graph.

What I then did was checking in EMLO if those people who were only mentioned in Reland’s direct correspondences had direct contacts with his correspondents or amongst each other. This would be something in between a real third-degree connection and a second-degree connection, so I decided to label it 2.5 degrees of separation. For those people and connections who had such connections, nodes and edges are coloured in blue to clearly distinguish them from the green nodes of the inner circle of direct correspondents and the green and black relations of these with Reland and amongst each other.

… and what they revealed

What’s really of interest now is of course: What did I gain from doing this? Is there anything new for my project in there? And yes, it was. There are 116 people mentioned in the letters between Reland and his correspondents, 97 out of which still lived in 1680, the year which I took as the point of demarcation between roughly ‘contemporary’ scholars and those whose correspondences I did not take to be relevant to Reland’s connectedness within the republic of letters in any way (this starting point is of course debatable, but one has to start somewhere). This testifies to Reland’s letters discussing more recent issues then debating past works and results; quite a large share of these 97 scholars mentioned whom I designated as ‘contemporary’ actually survived him, sometimes for several decades.

Of the 97 contemporaries mentioned, 26 had contacts either amongst each other – represented by blue arrows – or with members of the green inner circle of correspondents, represented by black arrows. Together with the interconnections of Reland’s direct correspondents between themselves, the second degree of the Ego network, the second-and-a-half-degree connections make clear that he actually was situated in an environment where most people directly or indirectly knew each other, and much of what he relates to in his letters has to be seen in this context. Although these people were spread out across the Netherlands, France, Britain, the Holy Roman Empire, Italy, and Denmark, it seems that they formed a remarkably tight-knit community. If this was a strength or a weakness of the network in question would have to be evaluated against contextual information which EMLO does not provide, but it gives hints where to look next.

Mind the gap!

All I’ve written in this post so far has to be taken with a grain of salt, of course, because EMLO is – as great and wonderful a resource as it is – far from being complete (although I would think it is comprehensive). This means that most probably there are interconnections which I missed out on because they are not (yet) in there. And this becomes even more pronounced as I did not close-read all of Reland’s remaining letters but only about a third of them, so I have missed out on a lot of mentions which would have given me new leads to track in EMLO as well. From the point of a study of remembrance and forgetting such as mine this is of course something to emphasize: What is in there is what is still – at least in some way – in circulation, in this case triggered by current research into these phenomena; and the gaps are caused by processes of discarding and source loss, which are parts of structural forgetting. So by mapping out the gaps, I do get a better grip on what I am really at also. And it’s never bad to gain added benefits from something.

And: Mind the results nevertheless!

But the point was precisely this: To see what I could do with this resource even as it stands now and regardless of the patchiness of my own research so far. And that proved quite a success, because in all likelihood I would only have ended up with more connections in the end, not less, which strengthens my initial hypothesis that the 2.5 degrees are a useful way of coming to terms with gaps in the physical evidence. In Reland’s case, this worked out well and points to him as really being closely connected within a certain epistemic community (as I once termed this) of his day.

What now remains to be done is to see if this also works out for my other three protagonists, since this would provide a way to cope with the dearth of direct epistolary evidence. I’ll see to it that I can present some preliminary results from going in this direction during the coming weeks.

PS: Actually, it’s a funny coincidence that today is not only the 37th Friday of my project but also my 37th birthday. Makes it feel even better to be back on track again. And now I’m off for some cake. See you next Friday!

Proof of Concept

Monday, January 28th, 2019, for Friday No. 17, January 25th, 2019

Apologies first: This post took me a little longer than usual, I’m two and a half days late now. This is due to what I wanted to present here: The first two completed data sets for the tracking of processes of forgetting in the humanities from my project. And finishing the second one took me about 18 hours longer than I had planned. You never know what’s in the sources beforehand…

Data Sets

But now these two sets are done and ready to be presented – at least, a rough oversight of the yields of these collections. What I have done here is going through two journals, the Philosophical Transactions and the Journal des Savants, from 1700 until 1800 (well, in the case of the Journal des Savants until 1792). I went through two digitized Hathi Trust collections to be able to use fulltext search, so for everyone who’d like to check on my results, here you go: Journal des Savants and Philosophical Transactions. The few missing issues were added using other similar Hathi Trust collections. I entered all issues bearing references to my four protagonists into my NodeGoat database, identified all persons co-cited with my protagonists in these instances as good as possible, and also all publications cited therein which gave me lists like these here.

December issue of the Journal des Savants, 1782, Reference to Eusèbe Renaudot and co-citations

To fully explore these datasets will take me some time still, but I do already have some preliminary findings to share.

First: Comparability

There is an obvious imbalance between the two journals regarding coverage of my protagonists. The Journal des Savants returned 117 issues with matches, while the Philosophical Transactions returned 8. Yet this is obviously caused by their asymmetric schedules: While the Journal des Savants appeared weekly from the start and monthly later on, the Philosophical Transactions appeared once a year, or once every two years. So to make for a better comparison, the Philosophical Transactions issues cover 12 years between 1744 and 1771, while the Journal des Savants issues cover 54 years between 1702 und 1789. And while the Journal des Savants data set includes about 4,5 times as much issue material over time, these individual issues are richer in both references and co-citations than the Philosophical Transactions issues are, although the exact factor still has to be determined. Overall, the Journal des Savants was definitely much more interested in the results of my protagonists over time than the Philosophical Transactions ever were. Not that much of a surprise, one might say, given that both journals were active in different areas of knowledge production and that the Philosophical Transactions were much more interested in natural philosophy than in what we would today call humanities’ research (as I already discussed some time ago). So please keep this in mind for the following visualisations.

Second: Visualisations!

The combined datasets in full extensions: The complete network of references from 1702 until 1789. Directly visible: Three of my protagonists, Thomas Gale (bottom left quadrant), Adrien Reland (bottom right quadrant), and Eusèbe Renaudot (middle of top half) do have their quite separate circles of references with a shared overlap in the middle.
The full extension of the Journal des Savants dataset: The complete reference network from 1702 until 1789. Directly visible is a much weaker position of Thomas Gale (top right quadrant), and an enhanced position of Eusèbe Renaudot (bottom left quadrant).
Full extension of the Philosophical Transactions dataset. Directly visible is that it is much smaller, contains less references to authors (therefore smaller red circles), and that there is no connection between a shared reference network of Thomas Gale and Adrien Reland on the left and a much smaller Eusèbe Renaudot network on the right hand.

Moving pictures!

A diachronic visualisation of the combined datasets in (something like) moving ten-year-averages for the time in which they overlap, 1740 until 1779.
The Journal des Savants dataset in simple ten-year-averages from 1702 until 1789. The most interesting thing is that this dataset allows you to directly see the falling apart of a once shared reference network from the 1760s onwards. As this is precisely what I want to track and show in this project, I take this result for a preliminary proof of concept: It actually seems to work, if only within a certain framework as I already had supposed (cf. the combined dataset video where this does not become apparent).
And, last but not least, the ten-year-average visualisation of the Philosophical Transactions dataset also, which directly allows to see the huge differences between both journals regarding my protagonists.

To preliminary conclude

This rather fast overview over my first two completed data sets conveys two messages, I think: First of all that a rather more thorough exploration in terms of statistics and metrics is necessary to put my preliminary findings on a firmer basis, and second, that – and these are my preliminary findings for today – my system and framework actually does seem to work. While this is great, it poses a lot of new questions as to the framing: Can both data sets be acutally merged together as I did in the combined visualisations? Or are they so different that such combinations are of no use? And if they are, where do these differences come from? Different perspectives on science? National and/or confessional framings, as might be indicated by the very different weights of the English and Anglican Cleric Thomas Gale and of the French and Catholic Cleric Eusèbe Renaudot in both sets? Or something in between, or something third?