INTRODUCTION. 95 
series are nothing but a sort of homogeneous pulp, endowed with motion 
and sensibility *. 
* Before my time, modern naturalists divided all invertebrated animals into two 
classes, Insects and Worms. I was the first who attacked this method; and in a 
memoir read before the Society of Natural History of Paris on the 10th of May, 1795, 
and printed in the Decade Philosophique, I presented a new division, in which I 
marked the characters and limits of the Mollusca, Crustacea, Insects and Worms, 
Echinodermata and Zoophytes. Ina memoir read before the Institute on the 31st 
of December, 1801, I ascertained the red-blooded worms or Annelides. And finally, 
in a memoir read before the Institute in July, 1812, and printed in the Annales du 
Museum d’ Histoire Naturelle, tome xix, I distributed these various classes in three 
divisions, each of which is analogous to a branch of the vertebrata. 
