68 



PHYSIOLOGICAL CHEMISTRY. 



In the marrow of the long bones it is more abundant than in any 



other tissue, occurring both in- 



FlG - 8 - closed in vesicles and in the 



form of free oil-drops. It exists 

 in considerable quantity in the 

 yellow wall of the corpus luteum. 

 It is also deposited in the sub- 

 stance of muscular fibres under 

 various conditions ; in those of 

 the voluntary muscles after pro- 

 longed disuse, those of the heart 

 in fatty degeneration of this or- 

 gan, and those of the uterus after 

 delivery. In the uterine muscu- 

 lar fibres it makes its appearance 

 soon after parturition, and con- 

 tinues to be present during the 



HEPATIC CELLS containing oil-globules. Human, involution or resorption ' of the 



uterine tissue. 



Source of Fat in the Animal Body. It is evident from the compo- 

 sition of many nutritious substances consumed by man and animals 

 that a considerable quantity of fat is introduced into the body with 

 the food. The oleaginous ingredients of the cereal grains, of nuts and 

 olives, of eggs, milk, and meat, show that both animal and vegetable 

 foods contribute a certain propor- 

 tion of fat to the system. But it 

 appears that fatty substances may 

 also be formed within the body, 

 for under some conditions more 

 fat is deposited in the adipose 

 tissue and elsewhere than can be 

 accounted for by that introduced 

 during the same time with the 

 food. This fact has been placed 

 beyond question by the experi- 

 ments of Dumas and Milne 

 Edwards * on bees, those of 

 Persoz on geese, those of Bous- 

 singaultf on geese, ducks, and 

 pigs, and those of Lawes and 



Gilbert t On pigs. In these ex- MuscuLAR FIBRES OF HUMAN UTBBUB three weeks 



after parturition. 



periments the amount of fat in 



the whole body was first ascertained by comparative examination of 



other animals in the same condition. The subjects of the experiment 



*Annales de Chim. et de Phys. 3 me Serie. torn. XIV., pp. 400, 408. 



f Chimie Agricole. Paris, 1854. 



J Philosophical Magazine. London, 1866. Vol. XXXII., p. 439. 



FIG. 



