THEORIES OF LAMARCK AND DARWIN ShS 
he succeeded. The fruit of his labors, the Natural His- 
tory of Invertebrated Animals (Historie naturelle des Ani- 
Fic. 112.—LAMARCK, 1774-1829. 
From Thornton's British Plants, 1805. 
maux sans Verlébres, 1815-1822), became a work of great 
importance. He took hold of this work, it should be re- 
membered, as an expert observer, trained to rigid analysis 
