24* Analyfis of the Air. 



of water. I marked the boundary of aic 

 and water, and then immerfed the whole 

 receiver, which had the breath in it, under 

 water, and there gradually poured the con- 

 tained breath up into the other full receiver, 

 which flood inverted over o s ; whereby I 

 could readily find, whether the air had loft 

 any of its elafticity : And for greater furety, 

 I alfo meafured the bulk of breath by filling 

 the receiver with a known quantity of water 

 up to the above mentioned mark ; making 

 alfo due allowance for a bulk of air, equal 

 to the capacity of the large fyphon s b, 

 which was at laft fucked full of water. 



The event was, that there was 1 8 cubick 

 inches of air wanting $ but as thefe receivers 

 were much too fmall to make the Experi- 

 ment with accuracy ; that fome allowance 

 may be made for errors , I will fet the loft 

 of elaftick air at 9 cubick inches, which is 

 but ~ part of the whole air refpired, which 

 will amount to 3 5 3 cubick inches in one 

 hour, or 100 grains, at the rate of 48000 

 cubick inches infpired in an hour, or one 

 ounce and a half in twenty four hours. 



By pouring the like quantity of air to and 

 fro under water, I found that little or none 



of 



