While reading about different aspects of Johann Heinrich Lambert's life and work, I found many interesting side remarks about Lambert's work by different authors, though it is very hard to find modern articles about them. Already in Lambert's book Photometria there are many examples of very interesting points (mentioned in its Wikipedia article) that have not received enough attention yet.
However, the book "Photometria" is not the issue here. On p.240 of the book "Discovering the Principles of Mechanics 1600-1800: Essays by David Speiser", the author of the chapter on Lambert writes:
To illustrate his originality as a physicist we can mention his contributions to studies of the resistence of fluids and friction as well as his work on the fluidity of sand, topics that physicists and mathematical physicists of the 1760s mostly (and happily) left aside.
I found this topic very interesting and truly original for a 18th century researcher. Searching a bit more, I found the title and abstract of this memoir of Lambert: "Concerning the fluidity of sand, earth, and other soft bodies, as far as it relates to the laws of hydrodynamics".
So I'd like to know where I can look at this memoir (I did not succeed in finding it on Google), and also if there is any modern assessment of this aspect of his work. I hardly believe that there is any such assessment in the English literature, so I have no problem if any one can provide a link to such an article in a different language (I will use Google translate).