xii CONTENTS. 



PAGE 



298. The chemical characters of serous fluids 525 



299. The characters of chyle 525 



The movements of Lymph. 



300. The causes which maintain the flow of lymph .... 526 



301. The influence of the nervous system on the flow of lymph . . 528 

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



filtration and diffusion 529 



303. (Edema or dropsy ; its causes 536 



304. The structure and functions of lymph-hearts 537 



SECTION XI. 

 ABSORPTION FROM THE ALIMENTARY CANAL. 



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



open for them 539 



The Course taken by the several Products of Digestion, 



306. The course taken by the fats 540 



307. The course taken by water and salts 541 



308. The course taken by sugar 541 



309. The course taken by proteids 542 



The mechanism of absorption. 



310. The mechanism of the absorption of the fats 544 



311. The pumping action of the villi 547 



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

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



cells 548 



313. The two stages of the act of absorption ; their nature . . . 552 



CHAPTER II. 



RESPIRATION. 



SECTION I. 

 THE STRUCTURE OF THE LUNGS AND THE BRONCHIAL PASSAGES. 



314. The function of the lungs chiefly mechanical 554 



315. The structure of the lung of the newt 555 



316. The structure of the lung of the frog 556 



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



infundibula and alveoli 557 



318. The structure of an infundibulum . 558 



319. The structure of the trachea and bronchi 559 



320. The structure of the bronchia and bronchioles .... 560 



321. The structure of the alveoli 560 



322. The lymphatics of the lungs 561 



323. The nerves of the lungs 562 



