LAMARCK’S WORK IN GEOLOGY 123 
in the earth, the enormous subterranean beds of coal 
that are met with in different countries, these are the 
witnesses of ancient encroachments of the sea, over a 
country covered with forests; it has overturned them, 
buried them in deposits of clay, and then after a time 
has withdrawn.” 
In the appendix he briefly rehearses the laws of 
evolution as stated in his opening lecture of his 
course given in the year IX. (1801), and which would 
be the subject of his projected work, Bzologie, the 
third and last part of the Terrestrial Physics, a work 
which was not published, but which was probably 
comprised in his Phzlosophie soologique. 
The Hydrogéologie closes with a “ Mémoire sur la 
matiere du feu” and one “sur la maticre du son,” 
both being reprinted from the Journal de Physique. 
