208 Exp&rim&tts on , the Production of Air 



Air produced, 9^ cubic inches ; quality, I tf -{- 3 = l.6l, 

 or 239. 



May 15. This air being removed, and its place sup- 

 plied with fresh water, the globe exposed in the sun this 

 day, from nine o'clock in the morning till five o'clock in 

 the afternoon, the weather being very fine, yielded By 4 /!) 

 cubic inches of air, which, proved with nitrous air, gave 

 i a -\- 4 n = i .74, or 326. The heat of the water in the 

 globe, during the experiment, was from 70 to 98 F. 

 The water had now lost considerably of its transparency, 

 and had assumed a light greenish hue. 



May 1 6. The air furnished yesterday being removed, 

 the globe furnished this day, during six hours of sun- 

 shine, 9 cubic inches of air, which, proved with nitrous 

 air, gave i a -\- 4 n = 1.44, or 356. 



May 17. The globe furnished this day, during 3^ 

 hours of sunshine, 6 cubic inches of air, of a very 

 eminent quality; for, proved with nitrous air, it gave 

 i *-|-4 = 1.35, or 365. 



May 1 8. This day cold and cloudy ; not more than 

 i^- hours sunshine; air produced f of a cubic inch; 

 quality i a -j- 4 n = 1.56, or 344. 



May 19. The globe appearing now to be quite ex- 

 hausted of air, shewing no signs of furnishing any addi- 

 tional quantity, though exposed to the action of a very 

 bright sun, I removed the globe from the window, and 

 placed it by the side of a German stove, where it was 

 kept warm to 100 F. from 10 o'clock in the morning 

 till 5 o'clock in the afternoon. By this means, I ob- 

 tained of a cubic inch of air, which, proved with ni- 

 trous air, gave i a -\- 4 n i .74, or 326. 



Not being able to obtain any more air from the globe, 

 I now put an end to the experiment. 



