DEFINITION OF THE TERM INSECT. 



11 



that of Vertebrata or animals that have a vertebral co 

 lumn, and Invertebrata or those that have no vertebral 

 column. These he distributes into three primary divi- 

 sions according to their supposed degrees of intelligence 

 — Thus : 



* Apathetic Animals. 1. Infusoria. 



2. Polypi. 



3. Radiata. 

 4*. Vermes. 



* * Sensitive Animals. (Epizoaria.) 



5. Insecta. 



6. ArachnidA. 



7. Crustacea. 



8. Annelida. 



9. Cirrhipeda. 

 10. mollusca. 



*** Intelligent Animals. 11. Pisces. 



12. Reptilia. 



13. Aves. 



14. Mammalia. 1 

 Profiting by the light afforded by the Aristotelian sy- 

 stem, this eminent zoologist improved, we see, upon that 

 of Linne, by resolving his Insecta into three classes, and 

 his Vermes into seven, interposing the Linnean Insecta 

 between the four first and three last, in which he was 

 not so happy, since as to sense insects should certainly 

 occupy the place he has here assigned to the Mollusca. 



In the work from which I have taken this statement 

 of Lamarck's system, that acute writer has given a sketch 

 of another method of arrangement, in which he has made 

 the first deviation from the beaten track of an unbroken 



a Atilm, sans Vertebr. i. 381. 



