398 DISEASES CLASS IV. 1. 4. 7 



chemical attraction, as when oxygen passes through the mem- 

 branes of the air-vessels of the lungs, and combines with the 

 blood. And lastly, by influx without mechanical attraction, 

 chemical combination, or animal absorption, as the universal 

 fluids of heat, gravitation, electricity, magnetism, and perhaps of 

 other ethereal fluids yet unknown. 



