CONTENTS, 



C H A P. III. 



A Defcription of the moft improved Microfcopes, and the 

 Method of ufmg them, p. 65. 



C H A P. IV. 



General Inftruclions for ufmg the Microfcope, and preparing the 



Objecls, p. 126. 



CHAP. V. 



Of Infers in general, p. 167. 



Of the Transformation of Infe&s, p. 189. 



Of the Refpiration of Infe&s, p. 240. 



Of the Generation of Infecls, p. 249. 



Of the Food of Infe&s, p. 272. 



Of the Habitation of Infe&s, p. 279, 



CHAP. VI. 



Giving fome Account of the Anatomical Structure of the Coffus, 

 or Caterpillar, which is found in the Trunk of the Willow ; 

 and feveral other mifcellaneous Objects, p. 323. 



CHAP. VII. 



The Natural Hiftory of the Hydra, or Frefh-water Polype, p. 393. 



CHAP. 



