C 243 ] 



fmall number of bubbles fettled 

 upon the under fide of the leaves, 

 but very few upon the upper fur- 

 face. The jar was placed in the 

 open air during about five hours, 

 the weather being cloudy. A fmall 

 quantity of air was obtained, which 

 was worfe than common air; 



97. I impregnated fome water 

 drawn out of a well with fixed air 

 by Dr. Noot's contrivance^ or by the 

 glafs apparatus fold at Mr. Parker's. 

 I put fome leaves of a vine in a jar 

 full of this water ; as'foon as they 

 were under water, they were all 

 covered moft beautifully with 

 bubbles. After flanding about 

 five hours in the garden in a cloudy 

 day, fome air was obtained, which 

 proved alfo, by the nitrous teft, to 

 be worfe than common air, the 

 greater! part of it being abforbed 

 R 2 by 



