204 Experiments on the Production of Air 



The wool at no time furnished more than one-third 

 part of the air which an equal quantity of silk would 

 have furnished under the same circumstances. 



The water was very faintly tinged of a greenish hue. 



Experiment No. 7. 



The water in the globe No. 2, with the eider-down, 

 began almost immediately to furnish air, and continued 

 to yield it during the whole time of the experiment 

 nearly in as large quantities as the water with silk had 

 done in the former experiments, and nearly of the same 

 quality. i-| cubic inches of this air, furnished the eighth 

 day from the beginning of the experiment, or the third 

 of sunshine, proved with nitrous air, gave i a -j- 3 n = 

 1.34, or 266 degrees of purity. 



The water was faintly tinged of a greenish, yellowish 

 cast; and the eider-down, when examined attentively, 

 appeared to be covered with a greenish slime. . 



Experiment No. 8. 



The globe No. 3, with the hare's fur (which was white), 

 furnished more air than the sheep's wool, but not so 

 much as the eider-down. After four days of sunshine, 

 I collected 2 cubic inches of this air, which, proved with 

 nitrous air, gave i a -\- 3 n = 1.44, or 256. 



The water had acquired a very faint yellowish hue ; 

 but it did not appear to have lost much of its trans- 

 parency, or to be disposed to deposit any sediment. 



The air produced in this experiment made its appear- 

 ance in a different manner from that furnished in those 

 preceding it, the air-bubbles which appeared upon the 

 surface of the fur being at considerable distances from 

 each other, and growing to an uncommon size before 



