156 Miscellanies. 



then boiled with animal charcoal to remove color, filtered hot, crys- 

 tallized repeatedly, and dried without access of light. About one 

 ounce of salicine will be obtained in the large way ; probably twice 

 the quantity would result, for great loss is occasioned by the above 

 numerous operations. It may be preserved in well closed bottles, ■ 

 and does not attract moisture. 



From the experiments of Miquel, Husson, Bally, Girardin, Cog- 

 non, &£C. at the hospitals and elsewhere, it is proved that from twenty 

 four to thirty grains of sahcine will arrest the return of the' fever, 

 whatever may be its kind. This is nearly the same as the dose of 

 sulphate of quinia. — Idem. 



10. Malic Acid. — (Liebeg, Ann. de Chim.) — This curious veget- 

 able acid has been obtained pure and crystallized, by M. Liebeg, and 

 carefully analysed, for the purpose of setting the discordant resuhs of 

 different chemists at rest. It was obtained from the expressed juice 

 of the ripe fruit of the mountain ash, by a complicated chemical 

 process. 



The equivalent number of the pure acid and its atomic constitu- 

 tion, were obtained by the decomposition of three of its salts ; the 

 malate of zinc, the malate of silver, and the malate of ammonia. 

 Its composition may be considered as follows: 



4 atoms of carbon, - - - - - 24 

 1 do. hydrogen, - - - - - 1 

 4 do. oxygen, - - _ _ - 32 



Equivalent number, - - - - 57 



Idem. 



11. Manufacture of charcoal. — (JJull. Univ.) — A new process, 

 recommended in the Journal des Forets for this purpose, is to fill all 

 the interstices in the heap of wood to be charred with powdered char- 

 coal. The product obtained is equal, in every respect, to cylinder 

 charcoal; and independently of its quality, the quantity obtained is 

 very much greater than that obtained by the ordinary method. The 

 charcoal used to fill the interstices, is that left on the earth after a pre- 

 vious burning. The effect is produced by preventing much of the 

 access of air which occurs in the ordinary method. The volume of 

 charcoal is Increased a tenth, and its weight a fifth. — -Idem, 



