S4 Description of a Compound Gasometer. 



with various bases, of forming particular salts, decomposable 

 in the fire, with more or less facility ; and that its attractions, 

 in one word, seem to follow a law completely different from 

 that of most of the known acids, since its miion with the 

 alkalis seems to be weaker. 



14. That it is decomposed bv warm sulphuric acid, by 

 the nitric, muriatic, and oxymuriatic acids, and reduced by 

 the latter, as well as by the nitric, into malic acid. 



15. That it seems to me to be composed, according to 

 the products obtained bv its analysis in the retort, of much 

 of carbon, and little hvdrogen and oxygen. 



! (). That 1 00 parts of watery extract of coffee, produced 

 from about 750 parts of coffee, yielded 0*55 of caffic acid, 

 0-2^5 of extractive matter, 0-05 of vegetable albumen, 0*09 

 of resinous matter, and 0"06 of loss. 



17. That in order to conform ourselves to the language 

 of modern chemistry, the acid of coffee ought to be called 

 cnffic add, as the denomination which best suits it. 



18. That the charry and incinerated residue of coffee is 

 composed of muriate of potash, lime, and a quantity of iron 

 which I was unable to appreciate. 



19. Finally, that coffee, from all we have seen, is a sub- 

 stance in which carbon is in a much greater proportion than 

 })ydrogen, oxvgen, or azote; the existence of all these bo- 

 dies having been plainly demonstrated bv the formation of 

 oil, pyromueous acid, carbonic acid, and ammonia, formed 

 in it bv the distillation of this crain. 



IV. Description of a Compound Gasometer, fov Vurpo'ie* 

 tvhere uniform Fress/ire is essential, hy the Application 

 of the Hydrostatic Regulator, By Joseph Steeveks, 



j\, (fig, 1. Plate I.) is a tin or brass cylinder three feet 

 six inches long and nine inches diameter, supported on tw» 



* Cosmnunieated by tb« iavefttor, Mr. SccereiM. 



pilUrs 



