tiil CONTENTS. 



CHAP. XXIX. page 302. 

 Circulation of the Blood. 



Siruflure of the Heart, and Circulation in cold-blooded Animals.-^* 

 Circulation in the ivarm-blooded Animals. Courfe of the Blood 

 through the Lungs* 'Through the reft of the Body. -~Ramif cations 

 of Arteries. Valvular Structure of Veins. Different from the 

 Structure of Lymphatics. 



CHAP. XXX.page 306. 



Secretion, Excretion, Abforption, and Nourifhment. 

 General Ejj'eQs of Secretion.' The Glands. Excretion. Secretion of 

 Bile. HO--W this Funttion is performed in Fijhes. Abforption. 

 Lymphatic Glands. Nourishment or Reparatitn of the Body.* 

 Bones become morefolid in old Age. 



CHAP. XXXI. page 312. 



Digeftion. 



Sen/aliens of Hunger andThirft.Prcgrefs of the Food to the Stomach', 

 Digeftion, how performed by Men and Quadrupeds. By Birds. 

 Tbs "Gizzard of Fowls, and its Ufes. Birds of Prey. Reaumur's 

 Experiments on th; Digeftion of Fo-tv/s. Motion of the Stomach and 

 Gizzard. Balls of Hair found in the Stc machs vf Quadrupeds. 

 Gaftric Fluid. Stomach iffeJf partly di/olved by its Aclion afier' 

 Death. Fermentation only takes place in difeqfsd Stomachs. 

 What Bub/lances are digrftible, and the contrary. Powers of Di- 

 ge/lion in different Animals. Carnivorous. Granivorous. Gra- 

 mni*vorous. Sleeping Animals. Accommodating Power of the 

 Stomach. 



CHAP. XXXII. page 329. 



Refpiration and Animal Heat. 



Refpiration in part an involuntary Function. Fo-ir Stages of Refpira- 

 tion. Ufcs cf RefftiralioH. R.cfpiration of Infecis different front 

 that cf ether Animals. The red Colour cfthe Blocd derived from the 

 Air in fafiiration. Dr. Priefiley's Experiments. -Dr. Good<veht'i 

 Experiments. The oxygenous Part of the Air diminifocd by Refill- 

 ration.- Fixed Air generated in the Lungs in Refpiration and 

 expired. Animal Heat produced by Re/piration. Inftanced in 

 difierer.t Animals. Dr. Crawford's ingenious Theory. 



CHAP. XXXIII. page 343; 



The Voice. 



lAftrument of Sound" in the Animal Body. The Larynx. Experiment) 

 on. the JfiK.ipipes cf different Animals. Whether the Larynx ai as 

 a wind or jl ringed Injlrument. Singing, hovj performed. Speak- 

 ing. Whijpering. 



CHAP. XXXIV. page 346. 



Mufcular Motion. 



Jai^iiry whether any Thing equivalent to mufcular Motion is to be found 

 in the ether Parts of Creation. Different Hypothefes concerning the 



Caufe 



