134 SANGUIFICATION, LiECT. VII. 



LECTURE VII. 



SANGUIFICATION. NUTRITION. ANIMAL HEAT. 



ARGUMENT. H&matosis or Sanguification. Composition of the blood; 

 blood corpuscles. Arterialization of the blood ; influence on this pro- 

 cess of atmospheric oxygen, of the removal of carbonic acid, and 

 of the serum ; agency of the iron of the blood. Conversion of arterial 

 into venous blood. 



Nutrition ; effected during the passage of the blood through the capillaries ; 

 renovation of the tissues; catalytic action of the blood corpuscles. Che- 

 mical changes which the blood undergoes in the capillaries. Trans- 

 formations of the alkaline salts of the vegetable acids, of benzoic acid, 

 and of salicine. Conversion of food into living tissues. Formation of 

 urea out of the tissues. Uses of fat. Physiological nature of bile. 



Animal heat. Heat produced in the body by the combustion (oxidation) 

 of carbon and hydrogen. Influence of the division of the pneumo- 

 gastric nerves. Experiments of Dulong, of Andral, and Gavarret. 

 Conclusions. 



Heat evolved by plants during germination and fecundation. 



IN the preceding lecture I have shown that, during 

 respiration, a portion of the oxygen of the inspired air 

 disappears, and that, in its place, is found a volume, 

 either equal or less, of carbonic acid ; that the expired air 

 is saturated with vapour, and that at the very moment 

 when these changes are taking place in the lungs, the ve- 

 nous blood is converted into arterial blood. We have also 

 seen that all these phenomena occur out of the living 

 body and under the same conditions as when they take 

 place within it. It now remains for us to examine in de- 



