* 
2 63 Mr. Cavendish’s Experiments on the 
The mixed air forced into the bent tube from the refervoir was 
6650 meafures, befides which Mr. Gilpin had at different 
times introduced 630 of common air, which makes in aji 
7280, containing 4570 of dephlogiflicated, and 2710 of com- 
mon air. 
The foap-lees were evaporated to drynefs as before. The 
refiduum weighed two grains, blit there were two or three glo- 
bules of mercury mixed with it, which might very likely weigh 
half a grain. This being diffolved in a fmall quantity of water,, 
the following experiments were made with it. 
It did not at all diicolour paper tinged with blue flowers. 
Slips of paper were dipped into it, and dried ; and, by way 
of comparifon, other flips of paper were dipped into a folu- 
tion both of common nitre and phlogifticated nitre, and alfo 
dried. The former burnt in the fame manner, and with as 
flrong marks of deflagration, as the latter. 
It had a flrong tafle of nitre, but left alfo a flight metallic 
tafle on the tongue. 
It did not give any white colour to a piece of clean copper 
put into it. 
In order to fee whether the whitifh fediment, which was 
before faid to be formed in the bent tube, contained any mer- 
cury, the remainder of this folution was diluted with fome 
more diflilled water, and fuffered to Hand till the white fedi- 
ment had fubfided. The clear liquor being then poured off, 
the remainder, containing the fediment, which feemed to 
amount only to a very fmall quantity, was put on a piece 
of bright copper, and dried upon it ; a piece of clean gold was 
then laid over it, and both were expofed to heat. Both metals 
acquired a whitifh colour, efpecially the gold, but which was 
very indeterminate. 
5 
In 
