the D/ffclutlon of Metals Hi Acids* 
water w aS made to droll, and a pneumatic apparatus was 
applied to catch any air or gas which might be extricated. 
The filver began to diffolve,and the folution became of a" purple 
or violet colour. No air was thrown into the inverted jar, except* 
mg a little of the common air of the retort, by means of the ex- 
panfion which it fuffered froiti the heat of the water-bath, and 
from fome nitrous fumes which appeared in the retort, and 
which having afterwards condenfed, occasioned the water to' 
nfe along the neck of the retort, and mix with the folution. 
The remamilig filVef Was then feparated and weighed, and it 
was fotlnd that 39 grains had been d i delved ; but probably 
more would have been diffolved if the operation had not been 
interrupted by the Water rufliing into the retort, 
6. In the fame apparatus 2od grains of (kuidard filver werl 
added to a mixture of ido grains of nitre previoufly diifolved' 
m 200 gram-meafures of oil of vitriol ; and in this folveiii’ qi 
giams of the filver were diffolved* Without any produtlion df 
air or Wt The which was of , vi„L colour ‘ ha”, 
ing been poured out of the retort while warm (for with fo‘ 
large a proportion of nitre, fuebi mixtures, efpedally after' 
having diifolved filver, are apt to congeal with fmall degrees of 
cold), in order to feparate the uildiffolved filvef from ' St, and' 
having been returned into the retort without this filver, I 
poured 206 grains of Wafer info' the retort, Upon which a ftron? 
effervefeence took place between the folution and' tfof wafeb’ 
and: 3100 gratn-mealures of nitrous gas were thrown into the" 
invfcrted jar. Upon pouring 200 grains more of water into the 
fetort,' 600 grain-meafufes of this fame gas were' expelled! 
Further additions of water yielded no more gas ; neither did ! 
the filver, wheh afterwards added to this diluted folution, give 
B b b 2 ariy 
