61 



Exp. 2. In another trial made in the same manner, except that the whole 

 of the distilled air was received together, without changing the bottle, the like 

 quantity of wainscot yielded 19200 grain measures of fixed & 42700 of in- 

 flammable air. The inflammable air requires to be mixed with more than 

 2ce its bulk of common air to make it explode, & its density was less than 

 that of common air in the proportion of 1"52 to 1. The weight of the whole 

 of this air is 71 grains, id est, near -^jy of the wainscot it was produced from. 

 This experiment is exactly consistent with the former, except that the quan- 

 tity of fixed air was greater, as might be expected, since the distillation was 

 performed in much less time, & consequently much less fixed air could be ab- 

 sorbed by the water. 



Exp. 3. I made another experiment with the same quantity of wainscot, the 

 distilling pot being this time placed in oil, that I might see what would be the na- 

 ture of the air which would rise with no greater heat than that of boiling oil. 

 The oil caught fire, which prevented me from completing the experiment ; I 

 however got 1 1500 grain measures of air, 5400 of which were fixed air, the re- 

 maining 6100 were inflammable, requiring somewhat more than 2ce their bulk 

 of common air to make them explode. Their density, allowing for the common 

 air in the distilling vessel, was about j^g- part greater than that of common air. 



Exp. 4. I also examined the air produced from tartar by distillation, though 

 not in so careful a manner as the wainscot. It yielded more fixed & less in- 

 flammable air than wainscot ; 400 grains of it yielded 46600 grains of fixed 

 air & 23500 of inflammable air. The inflammable air required to be mixed 

 with more than 4 times its bulk of common air to make it explode, & was 

 about Yi part heavier than common air. 



Exp. 5. 900 grains of hartshorn shavings were distilled exactly in the same 

 manner as the wainscot in the first experiment, except that the heat was raised 

 to a rather greater degree before the bottle was changed. The first distilled 

 parcel of air measured 33600 grains, & was reduced by sope leys to 20400. 

 The common air left in the distilling vessel was 1630 grains ; so that this air 

 when reduced by the sope leys contained 3^ of its bulk of common air. The 

 last distilled parcel measured 9400 grains, & was reduced by sope leys to 

 8900. 



Each of these parcels of air, when thus reduced, was found to be inflam- 

 mable. The first distilled air, tried in the same bottle as was used for similar 

 experiments on the air from wainscot, caught fire on applying a lighted candle 

 when mixed with 5 times its bulk of common air, but would not when mixed 

 with only 4 times its bulk. The 2nd parcel caught fire when mixed with 2§ 

 times its bulk of common air, but would not with 2ce its bulk. I then com- 

 pared the loudness of the explosion made by each of these parcels of air & of 

 some air from zinc, when mixed with 6 times their bulk of common air ; I could 

 perceive very little difi"erence between the 2 parcels of distilled air, but both of 

 them seemed to make rather more noise than the air from zinc. The same 

 difference in the manner of explosion between the distilled air and air from 

 zinc might be observed with these as with that from wainscot ; namely, that 

 the distilled airs went off with the duller sound, & exhibited a light in the 

 bottle, which was not visible with the air from zinc. 



