(Berlin, C.F. Voss, 1774). 4to. Uncut without wrappers as eXtracted from ""Nouveaux Mémoires de l'Academie des Sciences et Belles Lettres"", Annee 1772, pp. 33-64 and 1 engraved plate.
First edition. In this paper Lambert extends his theory of friction and tries to describe the fluidity of various semi-fluid substances according to the laws of Hydrodybamics.