236 CONDENSED GASES. 



clafliclty, fo that any quantity may be condenfed without 

 danger. My method of coUefting this, and other gafes 

 which are abforbable by water, is by means of an exhaufted 

 fiorence fla(k (and in fome cafes an empty bladder) connefted 

 by a ftop-cock with the extremity of the retort. 



An idea here occurs to me, that the facility of fixation 

 which is the property of the comprefled muriatic, oxy-muriatic, 

 and fome other gafes, may be made of fome utility to the 

 arts, fince by previoufly pouring in a little water, or other 

 fluid into the receiver, an acid may be obtained of aknoft any 

 degree of concentration. 

 Sulphureous Exp. 17. Having collected about a pint and a half of 



4e'(Ifed'b^°"ef- ^"^P'^^^'^O'is acid gas, I proceeded to condenfe it in the three 

 turc. cubic inch receiver, but after a very few pumps the forcing 



pifton became immoveable, being completely choked by the 

 operation of the gas. A fufticient quantity however had 

 been comprefled to form vapour, and a thick flimy fluid of a 

 dark yellow colour began to trickle down the fides of the 

 receiver, which immediately evaporated with the moft fufc 

 focating odour upon the removal of the pretfure. This ex- 

 periment corroborates the affirmation of Monge and Clouet, 

 mentioned in Acciim's chemifiry, vol. I. p. 319. viz, that 

 " by extreme artificial cold, and a ftrong prefTure exerted at 

 the fame time, they rendered fulphureoas acid gas fluid. 

 From the injury which this gas does to the machine, it will 

 be very difficult to perform any experiments upon its eledive 

 attradions with the other gafes. 



I remain. Sir, 



Your obedient humble Servant, 



T. NORTHMORE. 



J)evonJhire Street, Portland Place, 

 Feb. 15, 1806. 



On 



