56 MAKING OF COFFEE. 



Acet. of lead: 4th. A solution of atetate of lead in the same manner as 



no change. experiment 2d — no change. 



5th- A solution of acetate of lend was impregnated with this 

 gas in the same manner that nitrate of silver was in experi- 

 ment 3— no change. 



Conclusion. These te&Ls were sufficient to prove that no sulphuretted 



No sulph hydrogen was formed. 



hydrog. was _ ... T , , . . 



formed. fourth, y, I tested it tor carbonic acid. 



By litmu». i s t. 2d. and 3d. By f mus in all three of the ways in which 



litmus n ddened bv vin g«) ^as used tor ammonia- reddened. 



and by lime 4th. I ti Hod a vessel ^v i i ti mercury over tin bath, 



water ^ n d passed up a quantity of lime water, after which I parsed up 



the putrescent gas. — The lime was precipitated. 



and then an 5th. The precipitate erfervesced with the era/it, sulphuric, 



acid - nitric, and muriatic acids. 



Consequently the gas is carbonic acid : Probably holding a 

 Thegas prov- r . , ., , J r , . , x . . . . . , 



€d to be car- foetid oil (or some of the animal matter) in solution to which 



bonic. it owes its offensive odour. 



From the six ounces of animal substance I have already col- 

 lected 100 cubic inches of this gas. 



I am, dear Sir, 



Your obedient servant, 



JOHN MANNERS. 

 Philadelphia, Oct. 12th, 1612. 



XII. 



Of the excellent Qualities of Coffee, and the art of making it in 

 the highest perfection. By Benjamin, Count of Rumford, 

 F. R. S. Abridged from his ISth Essay, published in Lon- 

 don, 1812. 



Praises of 

 coffee. 



THE Count begins his Essay with an eulogium on coffee. 

 He celebrates it as uncommonly agreeable in its taste, 

 salubrious in its effects," and producing exhilaration which lasts 

 many hours, and is not followed by sadness, languor, or debility. 

 The glow of health, the consciousness of increased vigour of 

 mind it affords, and the uniform experience of many able, bril- 

 liant, and indefatigable men of the first talents in its favour — are 



among 



