[ xlvii ] 



abforbed by making it in common 

 water, but infinitely more readily 

 by the contact with quick-lime 

 Water. 



He fills one of the large receivers 

 of an air-pump, which are very 

 wide at their upper extremity 5 half 

 full of dephlogifhcated air extracted 

 from nitre, £o that it may contain 

 about 500 cubic-inches of this air 3 

 which will ferve for breathing dur- 

 ing half an hour. The manner of 

 drawing this air out of the receiver, 

 is either by thrufting a bended giafs 

 tube under the receiver (when this 

 is floating in water, in which it is 

 fupported by its peculiar bulky form), 

 reaching into the air itfelf, and 

 keeping the other extremity in the 

 mouth; thus drawing this air in the 

 lungs, and breathing it out by the 

 fame tube. This air returning from 



the 



