EXPOSURE TO HEAT. IT-) 



a small round pouting orifice. The skin of the 

 animal was tough and somewhat loose, and wrinkled 

 during the contractions its proprietor made. The 

 interior of the body exhibited an immense multitude 

 of globular particles of various sizes in constant 

 motion, but not moving in any vessels, or performing 

 a distinct circulation. 



My specimens had no visible eyes, and these 

 organs are, according to Pritchard's book, ''variable 

 and fugacious." The same authority remarks, "In 

 most vital phenomena they very closely accord with 

 the rotatoria; thus like these they can be revived 

 after being put into hot water at 113^ to 118°, 

 but are destroyed by immersion in boiling water. 

 They may be gradually heated to 216^, 252'', and 

 even 261°. It is also by their capability of resus- 

 citation after being dried, that they are able to 

 sustain their vitality in such localities as the roofs 

 of houses, where at one time they are subjected to 

 great heat and excessive drought, and at another 

 are immersed in water." 



When vital processes are not stopped by excess 

 of teaiperature, as is the case with the higher 

 animals, the power of resisting heat without de- 

 struction, depends upon the condition of the albumen. 

 Soluble albumen, or, as it should be called, Albu- 

 minate of Soda^ (for a small quantity of that alkali 

 is present and chemically united with it,) after 



