52 
MEMOIR OF LAMARCK. 
in consequence of Baron Cuvier’s observations on 
their circulating organs and the colour of their 
blood, which resembles that of the vertebrate races. 
Two other classes were created, in his “ Philosophi- 
cal Zoology,” viz. the infusoria and the ccniripedes ; 
and in this work also he first deviated from the 
ordinary practice of commencing the arrangement 
with the most perfectly organized, the inverse order 
being more in accordance with his theoretical views, 
which assumed a gradual progression in the compo- 
sition of animal organs, proceeding from the most 
simple to the most complex. 
It was in a small volume, entitled “ An Extract 
from the Zoological Course in the Museum of Na- 
tural History, on the invertebrate Animals,” &c. 
published in 181 2, that, he first presented his general 
distribution of animals into three grand divisions, 
apathetic , sentient , and intelligent. This plan he 
made the foundation of his great work, and the 
method in which he applied it, as well as his ideas 
regarding the constitution of the different classes, 
and their relation to each other, will be understood 
from the subjoined table. 
