to 100 degrees (for the fire was not kept up during the 

 night). Being taken out, dried, and weighed, it was found 

 to have lost seven grains and a quarter. The sohition had 

 a yellowish green colour, different from the light yellow 

 tinge of the pure alkaline ones. It also lost its taste, but 

 Avithout becoming sweet. A quantity of flocculent animal 

 matter was separated, and the dissolved uric acid Avas, for 

 the greater part, again precipitated, upon the mixture 

 cooling, to the temperature of the atmosphere. 



iEXPERIMENT XIII. 



The crystallized carbonate of potash, being generally 

 prescribed, in the proportion of one di-achm to four ounces 

 of water: in a similar mixture was suspended an entire 

 calculus, of a very compact, rough, and gritty app'^ar- 

 ance, weighing forty grains and a quarter. After remain- 

 ing ferty-eight hours in the above temperature, it was ta- 

 ken out, dried, and weighed, and found to have lost three 

 grains three quarters. The solution here more" highly co- 

 loured than in the former: some spontaneous precipitation; 

 and an immediate one, on the addition of a few drops of 

 weak marine acid. We then find the vegetable alkali in 

 the fullest state of saturation, with carbonic acid, that we 

 can procure it, in the solid form, acting powerfully on 

 these concretions, when assisted b}^ degrees of temj^eraturc, 

 even much inferior to that of the human body. 



Now, 



