264 A Jr. Cavendish’s Experiments on the 
bent tube from the refervoir *. Befides this, Mr. Gilpin had 
at different times introduced 872 meafures of common air, 
which makes in all 10162 of air, confiding of 6968 of de- 
phlogidicated air, and 3194 of common air. But as there 
were 900 meafures of air remaining in the tube when the 
accident happened, the quantity abfor bed was only 9262; but 
this is a much greater quantity that what from my own expe- 
riments feemed neceflary for this quantity of foap-lees. 
The foap-lees were poured into a fmall glafs cup, and the 
tube wafhed with a little diddled water, in order that as little 
as podible might be lod. As they were by this means confi- 
derably diluted, they were evaporated to drynefs ; but it was 
difficult to edimate the quantity of the faline refiduum, as it 
was mixed with a few particles of mercury. 
Some vitriolic acid, dropped on a little of this refiduum, 
yielded a fmell of nitrous acid, the fame as when dropped on 
nitre phlogidicated by expofure to the fire in a covered cruci- 
ble ; but it was thought lefs drong. The remainder was dif- 
♦ 
folved in a fmall quantity of diddled water, and the following 
experiments were tried with the folution. 
It did not at all difcolour paper tinged with the juice of blue 
flowers. 
It left a naufeous tade in the mouth like folutions of mer- 
cury, and mod other metallic fubdances. 
Paper dipped into it, and dried, burnt with fome appearance of 
deflagration, but not fo drongly or uniformly as when dipped 
in a folution of nitre. The marks of deflagration, however, 
were Aronger than when the Paper was dipped into a folution 
* The method of afeertaining the quantity of air forced in was by weighing 
the refervoir, as mentioned in the above-mentioned Paper, p. 374. 
of 
