from Water exposed to Light. 209 



The quantities and qualities of the airs furnished upon 

 the different days were as follows : 



Quantity. - Quality. 



TT u u ^u - uantty. - uay. 



Upon the i2th, i3th,) , , . 



r n/r > 9^ cubic inches i a -4- 3 n = i.oi, or 239 

 and i4th of May) 



i5th . . . ST* O <V ia + 4 1 -74> or 326 



i6th ... 9 ... la -\- ix 1.44, or 356 



i7th ...-6 ... i* -{- 4 == 1.35, or 365 



i8th ... - ... 1/7 -{- 4 = i-5 6 or 344 



i 9 th ... ^ ... 1/7 -}- 4 = i-74 or 326 



Total quantity 33fV 6 o mean 4 ual> * " 4~ 4 = 1-84* or 316 



i 



As in this experiment the air furnished each day was 

 removed at night, and the place it occupied in the globe 

 supplied with fresh water, I was desirous of seeing what 

 variation it would occasion in the result of the experi- 

 ment, if, instead of removing the air from time to time, 

 I suffered it to remain in the globe till the end of the 

 experiment ; to this end I made 



Experiment No. 14. 



In which the globe being filled with fresh water, and 

 the silk used in the last experiment (being first well 

 washed), the whole was exposed four days to the action 

 of the sun's rays, the weather being remarkably fine and 

 very hot. Upon removing the air produced, I found it 

 amounted to 30^3- cubic inches*; and its quality, proved 

 with nitrous. air, was i a -j- 3 n = 1.02, or 298. 



I should have continued the experiment for some days 

 longer, as the globe did not appear to be exhausted ; but 

 the quantity of air already collected in the globe was so 

 great that it became very difficult to remove it, without 

 running the risk of losing a part of it, or of letting the 

 air of the atmosphere enter the globe, either of which 



events would, of course, have spoiled the experiment. 

 VOL. i. 14 



