148 



THE AMERICAN NATURALIST 



[Vol. XLII 



Dr. C. E. Eastman, who was generously instrumental in 

 placing it in my hands. To him, therefore, and to Pro- 

 fessor Samuel llenshaw, curator of the Museum of Com- 

 parative Zoology, my thanks are due for the privilege of 

 examining it. 



In further detail, and in the matter of its published or 

 unpublished parts: 



The System*: de Hall is largely medical: it deals with 

 the brain, its anatomy, comparative anatomy, physiology, 

 pathology— the last in some detail as in idiocy, cretanism, 

 suicidal mania, hereditary insanity. I cannot find that 

 it has been published. 



The second essay, Idee et Imagination, has certainly 

 been published. It bears the note in Lamarck's hand, 

 "Articles du diction," and is signed by compositors. Dr. 

 Eastman suggests that it occurs in Nouv. Diet. Hist. Nat. 

 of Deterville, 1818, a work I have not been able to con- 

 sult. The writing indicates an earlier date than the 



The third portion, Apperea amdijtique des connais- 

 sances humaines, avec des divisions et des reflexions ten- 

 dant a montrer I ear dee/ re de Certitude, tears Sources, 

 leurs Branches principales, is probably the outline of -his 

 extended work (.'}(>2 pp.) on the same subject published 

 in 1820: it is entirely in his own hand and probably dates 

 not later than 1818 (the year in which his eyes failed 

 him). 



Of the fourth manuscript, Questions Zoologiques, the 

 first section is substantially as follows: 



" Zoological questions whose solution is of first importance. 



"First Question. — Animals and plants being living bodies (corps), 

 do these two kinds of organisms become confused (se confondent) at 

 a common point of the series which they form; or does there exist 



