I keep hearing many people saying the on-line materials should not be used in university classes nor in research. These individuals, from my perspective, are not worthy listening at because they are not up-to-date with information in their fields of interest. This attitude might have been useful 5 or 10 years ago, when there were less than 1 percent of what we have available today. But I cannot think we can continue this way. Look at what British Library or any other big library posts online. The French Gallica is another good example. If I am right, today, we cannot do research without taking into consideration latest advancements in our research areas made available within the virtual space. When you ask where you can find the latest edition of Proclus’ commentaries, indistinctly the answer is “on the Internet”. For this reason, I am going to refer here to those materials I find most useful. And the first link to take before you is the one regarding “The Logic Museum”.
Although it is a Yahoo website, at http://firstname.lastname@example.org/index.htm you may access texts or fragments of Logic which were never published or translated into English (e.g., Apuleius’ Commentary on “Peri hermeneias”, a fragment of Petrus Hispanus “Summa logicales” and so on). Copyright must be acknowledged to E.D.Buckner.
For those interested in Aristotelian logic, here is an interesting XVII century manuscript (available from British Library): http://image.ox.ac.uk/show?collection=bodleian&manuscript=msdigby117