302 METHOD OF CRYSTALLIZING LIME. 



Habitudes of Frogs kept in difiilled water foon become languid, and die. 



thefe animals in ^i ,. . , . , . 



ditferent fluids - 1 ne 7 cannot live m water impregnated with nitrous oxide, 



and gafes. nor in water holding carbonic acid gas in folution in consider- 



able quantity. They live in an atmofphere of pure nitrogen 

 for rive or fix days, if water be prefent. They inftantly die 

 in all hidrocarbonates ; but may be kept alive in nitrous gas 

 for fome days. 



XI. 



Tlie Method of cryftallizing Lime. By Tr o mmsdorff*. 



Hiftory of the JL HE cryflallization of lime was firft difcovered accidentally 



cryftallization of by Schaub# Bucholz alfo obtained very fine cry Hals of this 

 earth by boiling it with its muriate. I have verified this dif* 

 covery ; and find that lime may be obtained in cryftals equally 

 well in winter as in fummer ; with the exception, that the 

 fait prepared during the winter feafon forms cryftals which are 



Mow cffeaed. thicker and larger. In order to • obtain thefe cryftals, any 

 quantity, at pleafure, of the muriate of lime is to be boiled 

 with one fourth, or even lefs, of cauilic lime, and the fluid 

 concentrated until in winter a drop of the folution, let fall 

 upon a cold ftone, fiiall acquire the confidence of fyrup with- 

 out cryftallizing or congealing. The fluid is then to be firained 

 through a clofe cloth filter into a capfule of porcelain or earth, 

 •which is then to be covered with a fimilar capfule, or a wooden 

 cover, in order that the cooling may be as flow as poflible. 

 By this means very long but flender cryftals of cauitic lime 

 are obtained, which mpft bewaihed in alcohol to clear off the 

 adherent muriate. This operation mufl not be attempted 

 with a lefs quantity than feven pounds of muriate of lime. 



Refidue, after It is well known, that when muriate of ammonia is diftilled 



nia film mTh" with excefs of lime > f ' or its decompofition, part of the refidue 

 lime, is the cryf- adheres i'o ftrongly to the retort, that it is almoft impoffible to 

 tallied earth, detach it by foftening it. This hard mafs is for the moft part 

 formed of- lime confuiedly cryitallized, which is more dif- 

 ficultly diffufed in water than the fame earth in powder, or a 

 Hate of minute divifion. 



* Journal der Pharmacie, vol. ix. part 1. p. 108. 



XII.— On 



