INTKODUCTIOK. 25 



series are notliing 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 Philosophiquc, I presented a new division, in which I 

 marked the characters and limits of the Mollusca, Crustacea, Insects and Worms, 

 Echinodermata and Zoophytes. In a 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 distiibuted these various classes in throe 

 divisions, eacli of which is analogous to a branch ot the vertebratn. 



