ARTIFICIAL CAMPHOR. 



135 



To afcerlain whether there did not yet exift a further quan- 

 tity of this concrete matter ready formed, in this fort of mother- 

 water of camphor, it was expofed to an artificial cold of eight 

 or ten degrees below 0, during feveral hours. By this means Seven and half 

 it yielded other cryftals, which, coMeded like the preceding, J^ ^ 3 ™^ 

 offered the fame characters, and weighed two ounces; this of oil of turpen- 

 brings the quantify of camphor to feven ounces and a half for tine * 

 each pound of oil of turpentine. 



This liquor, not appearing capable of yielding more cry- More gas did not 



a 1 j- i i • \ 4 !• c if- u produce cryftals 



nals, was divided into two portions, one or which was re- [ n the refi ^ ua j 



ferved for examination in this Mate, the other was fubjecled to'iquor. 



the a&ion of a new quantity of acid gas; it diffolved a part of 



it, and became aim oft black, without lofing its tranfparence, 



even after remaining for feveral days in the cellar. 



Another dofe of oil of turpentine was charged with a pro- Double quantity 

 portion of gas, double that mentioned above. The precipi- of 8 as « 

 tation of camphor took place in nearly a fimilar quantity ; the 

 liquor was very little more coloured, but a much greater quan- 

 tity of fat oil was formed. 



An ounce of this matter warned in diftilled water, and put Aftion of dif- 

 in a niter to drain, became of the moft beautiful white; it no t j|! ed wate »" or » 

 longer gave figns of acidity, but had ftill an odour of turpen- 

 tine. The water in which it had been wafhed was very aro- 

 matic; it reddened the tincture of turnfole, and precipitated by 

 nitrate of filver. 



An equal quantity of the fame fubftance was wafhed with and of water # 

 water impregnated with a fiftieth part of unfaturated carbo- carbonate of * 

 nate of potafh : it loft much of its firft odour. potato. 



New portions of this rough camphor were mixed in equal Action of char- 

 parts, one with charcoal in powder, another with very dry q^k%me and 

 afhes, a third with quick-lime, a fourth with alumine (porce- alumine. 

 lain earth), and were introduced feparately into fmall glafs 

 alembics, the capitals of which were, by a gentle heat, ra- 

 pidly covered with diftinft groupes, compofed of a multitude 

 of fmall needle-formed cryftals, diverging from the fame 

 center. 



Purified in this manner, it entirely loft the odour of oil of Other properties* 

 turpentine; that which it retained was more analogous to com- 

 mon camphor, but not fo ftrong. In this ftate it fwims on 

 water, to which it communicates its tafie; it burns on its fur- 

 face, without experiencing the revolving motion obferved by 



' Profeflor 



