103 



the Vitreous State, Devitrificatioii and " Vitromelting." 

 A preliminary cliapter will hv devoted to tlie study of the 

 principles of heat eondiiction. 



Within each section, after having discussed the funda- 

 mental laws, Ave shall consider the various biological mate- 

 rials which undergo the changes of state, in the order of 

 the increasing complexity of these materials : pure water, 

 solutions, suspensions, emulsions, colloids, dead tissues, 

 living protoplasm, living cells and living tissues. 



