CONTENTS. Xlll 



THE VEGETATIVE FUNCTIONS. 



PAGE 



DIGESTION, 480 



Sources, Varieties, and Nature of Human Food, . . . 481 



Prehension and Preparation of Food, . . . . . 485 



Mechanical Processes of Digestion, . . . . . . ' . 488 



The Digestive Fluids, 520 



Chemical Processes of Digestion. . 544 



Summary of the Chemistry of Digestion, 564 



Circumstances which modify Digestion, 566 



Eelative Value of different Foods, 569 



The Organs and Function of Digestion in Animals, . . . 571 



ABSORPTION, . . * .' . . . . . . . . 599 



The Absorbent Vessels and Glands, . - . 600 



Endosmosis, Exosmosis, Osmosis, and Dialysis, .... 606 



General Absorption, 614 



Absorption of the Food, . 621 



Intrinsic Absorption, 627 



The Absorbent System, and Absorption in Animals, . . . 630 



CIRCULATION, . ..--,. . . .. . ". , . - ., . . 631 



The Heart and Bloodvessels, . . / . ' 632 



Course and Causes of the Circulation, . ... . , . . 641 



Action of the Heart, . . . .... ; . . . 643 



Motion of the Blood through the Arteries, ... . * . . . . 658 



The Pulse, . .* -. "..,. ;., , .T , . > ,,\; ... ,. . 666 



Motion of the Blood through the Capillaries, v ..., .'. ; . , . 673 



" " Veins, . ..... .677 



Period of a complete Circulation, ^. : , , . 684 



Quantity of Blood in the Body, . *"',. . , :> . ; . ; , . . 687 



The Uses of the Blood and its Circulation, 689 



Organs and Function of the Circulation in Animals, . . . 689 



NUTRITION, . . .' . . ... . . v . 698 



Nutrition of the Chyle, . ^ .- - V>- i. '' V ' . . -., . 699 



" " Blood, ... . . *. ! . '. .700 



" " Organs and Tissues, ;d ^ - '. ^ k I 70 



Offices of the Blood and of its Constituents in Nutrition, / ,- ^ . 707 



Hemorrhage, or Loss of Blood, 714 



