xxvi CONTENTS. 



378. The relations of the secretion of bilirubin to the secretion of bile 



acids 587 



379. The relation of the secretion of bile to the formation of glycogen . 587 



SECTION IV. 

 ON UREA AND ON NITROGENOUS METABOLISM IN GENERAL. 



380. Urea the end-product of the metabolism of proteid matter . . 589 



381. Urea probably the result of a series of changes . . . 590 



382. The kreatin of muscle in its relations to urea . .... 590 



383. Difficulties presented by the normal presence of kreatin in urine . 591 



384. The nitrogenous metabolism of the nervous tissues .... 592 

 385. The nitrogenous metabolism of the glandular structures. The 



increase of urea due directly to food 593 



386. The formation of urea in the liver 594 



387. The synthesis of urea . 595 



388. Uric acid ' 596 



389. Other nitrogenous crystalline bodies, such as xanthin, &c. . . 597 



390. Relations of urea to cyanogen compounds 598 



391. A summary of nitrogenous metabolism 599 



SECTION V. 

 ON SOME STRUCTURES AND PROCESSES OP AN OBSCURE NATURE. 



392. The structure and functions of the thyroid body ... . . 600 



393. The pituitary body '.' " : ' '. . . 601 



394. The structure, chemical constituents, and functions of the supra- 

 renal bodies 601 



395. The structure, nature, and functions of the thymus ' : "*'' V .. 602 



SECTION VI. 

 THE HISTORY OF FAT. ADIPOSE TISSUE. 



396. Adipose tissue ; its changes 604 



397. The structure of adipose tissue 604 



398. The disappearance of fat from adipose tissue 605 



399. The nature of fat in adipose tissue . . . . . . . 606 



400. Fat is formed in the body 606 



401. Formation of fat from carbohydrates and from proteids . ... 608 



402. Limits to the construction of fat .609 



SECTION VII. 

 THE MAMMARY GLAND. 



403. The general structure of the mammary gland 610 



404. The structure of the alveoli ; the varying appearances* of the epi- 

 thelial cells , . 610 



