No. 495] LAMARCK MANUSCRIPT IN HARVARD 151 



" Supplemental Question : 



"Eleventh Question— It each particular system of organs gives rise 

 to a particular faculty, can this faculty be found again in an animal 

 in which the system of organs which produces it no longer exists; or 

 can not this same faculty he regarded as destroyed when the system 

 of organs which has given rise to it ceased to exist?" 



These questions date from the period 1810-18, with 

 the probability that they belong nearer the later than the 

 earlier date, for in his "Philosophic Zoologique" (1809) 



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his views were by no moans as advanced. He then spoke 

 of the essential differences which distinguish plants and 

 animals, and did not query their common origin, and did 

 not seek a trenchant character which would serve to dis- 

 tinguish them. Moreover, he did not then query the 

 possible kinship of sensation and irritability in sensitive 

 plants and in animals, for at that time he had seen no 

 reason to deny the elastic-fluid explanation for the sensi- 

 tive movements of plants. Altogether these questions 

 are of considerable interest in the study of the develop- 



