xvi Contents 



not seem to come from the sea, p. 175. But from rain-water, 

 p. 176. How an artificial spring can be made, p. 177. Why 

 a saline-sulphureous mineral becomes hot when exposed to 

 moist air, 177. Air is lodged in the pores of water, p. 177. 

 Fishes draw air from the water, p. 179. On the air con- 

 tained in the swimming-bladder of fishes, p. 179. The heat 

 of the hot springs depends on air, p. 180. Why spring- water 

 is a little warm, p. 182. Why soap will not mix with it, p. 

 182. 



SECOND TREATISE.— 01^ RES- 

 PIRATION. 



The explanation of the entrance of air into the lungs, p. 

 183. It is not from fear of a vacuum, p. 183. Nor because 

 the air is pushed forward by the dilating chest, p. 184. 

 The inflation of the lungs depends on the pressure of the 

 atmosphere, p. 184. In what way it can be brought about 

 by the elastic force of the air, p. 185. Whence the elastic 

 force of the air arises, p. 186 ; see Treatise i, Chapter VII., 

 p. 67. The inflation of the lungs illustrated by examples, p. 

 186. The lungs cannot expand themselves spontaneously, 

 p. 187. Why, when the thorax is perforated, the lungs 

 protrude from its cavity, p. 188. In what way the lungs are 

 inflated when the chest is wounded, p. 189. How wounds 

 of the chest should be closed, p. 189. How the chest is 

 dilated, p. 190. The external and also the internal inter- 

 costal muscles act in dilating the chest, p. 190. Why the 

 said muscles are inserted obhquely into the ribs, p. 192. 

 Why in dead bodies the thorax is always contracted, p. 193. 

 The ribs are connected to the spine by a double articulation, 

 p. 194. These articulations contribute to the dilatation of the 

 chest, p. 194. Why the ribs are joined to the sternum by 

 means of cartilages, p. 195. The diaphragm contributes to 

 the dilatation of the chest, p. 195 ; see Treatise 4, Chapter 

 VII., p. 287. On various ways in which respiration may 

 suffer, p. 196. On the so-called broken-windedness of 

 horses, p. 197. On orthopnoea, p. 197. On uterine suffoca- 



