564 TISSUES OF THE CONNECTIVE SUBSTANCE. 



alimentation, a nutritive substance of great importance in the develop- 

 ment of heat and vital force, which substance, on insufficient nutrition, 

 is given up as may be needed. On account of their low conducting 

 power, the fatty tissues become of great importance in regulating the 

 loss of heat from the body. They also serve to fill cavities and act as 

 a protection and support to certain internal organs. 



