xviii CONTENTS. 



PAGE 



487. The nitrogenous metabolism of the glandular structures. The 



increase of urea due directly to food ...... 754 



488. The formation of urea in the liver 755 



489. The synthesis of urea . 756 



490. Uric acid 757 



491. Other nitrogenous crystalline bodies such as xanthin &c. . . 758 



492. Kelations of urea to cyanogen compounds 759 



493. A summary of nitrogenous metabolism k . . . . . . 759 



SECTION VI. 



ON SOME STRUCTURES AND PROCESSES OF AN OBSCURE NATURE. 



494. The structure of the thyroid body . . . . . . . 761 



495. The functions of the thyroid body 763 



496. The pituitary body 764 



497. The structure of the suprarenal bodies . . . . . . 765 



498. The chemical constituents of the suprarenal bodies .... 766 



499. The functions of the suprarenal bodies 766 



500. The structure of the thymus . . .*.--. . . . 767 



501. The nature and functions of the thymus 768 



SECTION VII. 

 THE HISTORY OF FAT. ADIPOSE TISSUE. 



502. Adipose tissue ; its changes 769 



503. The structure of adipose tissue 769 



504. The disappearance of fat from adipose tissue ... . 771 



505. The nature of fat in adipose tissue . . . . .'. . 772 



506. Fat is formed in the body 772 



507. Formation of fat from carbohydrates and from proteids . . . 773 



Limits to the construction of fat . 775 



SECTION VIII. 

 THE MAMMARY GLAND. 



509. The general structure of the mammary gland 777 



510. The structure of the alveoli ; the varying appearances of the epithelial 



cells 778 



511. The characters of the dormant mammary gland .... 780 



512. The connective-tissue of the mammary gland 780 



513. The nature of milk; its constituents; their relative quantities in 



different animals 780 



514. Colostrum, its chemical and microscopical characters . . . 783 



515. The mammary gland at birth ......... 784 



516. The nature of the act of secretion of milk r i. . . . 784 



517. The secretion of milk typical of metabolism in general . . . 785 



518. The relations of the gland to the nervous system .... 787 



