424 ORGANIC CHEMISTRY. 



these objects. With the addition of a little soda and 

 gum, milk may be thus kept sweet in the solid condition 

 for many months. The addition of water is all that 

 is necessary to reproduce it in its original form. 



CHEMICAL CHANGES IN THE ANIMAL BODY. 



1054. Certain important changes which 



What is said 



of changes in are constantly occurring in the animal body 

 ^animal remain to be considered. The body is 

 not the same in any two successive mo- 

 ments of its existence. Every breath exhales a por- 

 tion of its substance into the atmosphere, and every 

 effort, whether of brain or muscle, is accompanied by 

 some transformation in the material of which it is 

 composed. 



1055. CHANGES IN THE BLOOD. By com- 



Mention cer- 

 tain changes paring the blood of animals with their 

 in the blood? foodj it win be evident that certain mate- 

 rials have been not only modified, but entirely trans- 

 formed in its production. Starch and sugar are impor- 

 tant constituents of the food, but. they form no part of 

 healthy blood. They are transformed into fat or other 

 material as soon as they enter the circulation, and in 

 this new form constitute the fuel from which the heat 

 of the animal body is derived. Other changes which 

 occur in the blood will be mentioned in subsecuient 

 paragraphs. 



1056. ANIMAL HEAT. The oxygen 



What is the 



source of an- which is necessary for the slow combustion 

 imalheat? Q f ^ mater i a i aDove mentioned, is taken 



into the blood in the course of its passage through 



