[ 2^9 ] 

 They became mofl beautifully co- t ^ an ; f 

 vered with an infinite number ef^SS 

 round air-bubbles. A great deal of troyed * 

 dephlogiiticated air was obtained, 

 which gave, by the nitrous teft, 

 1.96; 1.87; 1.83J; 2.68; 3.64. 33 5 



93. Some branches of a mul- 

 berry-tree, covered with grey bark, 

 were put in a gallon jar full of 

 pump-water, and expofed to the 

 fun. A moderate quantity of air 

 was obtained, which, being put to 

 the nitrous teft, proved to be about 

 the fame quality with common air; 

 its tell was 2.01; 2.10; 3.10. X90 



SEC 



