x CONTENTS. 



PAGE 



298. The chemical characters of serous fluids 499 



299. The characters of chyle . . . . . . . . . 499 



The movements of Lymph. 



300. The causes which maintain the flow of lymph 500 



301. The influence of the nervous system on the flow of lymph . . 502 

 302. The phenomena of transudation. The relation of transudation to 



nitration and diffusion 503 



303. (Edema or dropsy ; its causes 507 



304. The structure and functions of lymph-hearts 509 



SECTION XL 

 ABSORPTION FROM THE ALIMENTARY CANAL. 



305. The main products of digestion, and the two paths of absorption 



open for them 511 



The Course taken by the several Products of Digestion. 



306. The course taken by the fats 512 



307. The course taken by water and salts 513 



308. The course taken by sugar ........ 513 



309. The course taken by proteids 514 



The mechanism of absorption. 



310. The mechanism of the absorption of the fats 516 



311. The pumping action of the villi 519 



312. The mechanism of the absorption of diffusible substances and of 

 water. Relations of the process to diffusion. Action of the 



cells 520 



313. The two stages of the act of absorption; their nature . . . 524 



CHAPTER II. 

 RESPIRATION. 



SECTION I. 

 THE STRUCTURE OF THE LUNGS AND THE BRONCHIAL PASSAGES. 



314. The function of the lungs chiefly mechanical . . ' . . . 526 



315. The structure of the lung of the newt 527 



316. The structure of the lung of the frog . . . . . . 528 



317. The general structure of the mammalian lung : bronchia, bronchioles, 



infundibula and alveoli 529 



318. The structure of an infundibulum . . ... . . . 530 



319. The structure of the trachea and bronchi . . . . . 530 



320. The structure of the bronchia and bronchioles .... 532 



321. The structure of the alveoli 532 



322. The lymphatics of the lungs . . .... . . 533 



323. The nerves of the lungs . . . . ; . . . . 534 



