134 ARTIFICIAL CAMPHOR. 



5th. What are the beft means of purifying this camphor, 

 and of freeing it from the odour which it retains ? 



6th. What are the relations and differences between the 

 purified camphor of turpentine, and that of the camphor- 

 laurel ? 



7th. Would liquid muriatic acid produce the fame effe6t ? 



8th. Would the other acids ad in the fame manner on this 

 oily fubftance ? 



The complete folution of thefe different queflions would 

 doubtlefs have required a great number of experiments, to 

 which we were unable to attend: we (hall only relate thofe 

 which we made. 

 Apparatus. With a view to obtain a more confiderable product, which 



would yield us the concrete matter in a quantity fufficient to 

 be afcertained and fubje&ed to different experiments, we pre- 

 pared an apparatus fimilar to that ufed by the author of the dif- 

 covery, but of larger dimenfions. It confifted of a tubulated 

 retort, and two WoulPs bottles, provided with their tubes of 



r. „• e communication and fafety. Four pounds of marine fait, and 



proportion or J * ■ 



ingredients. two pounds of concentrated fulphuric acid were introduced 



into the retort? four pounds of very white oil of turpentine 

 were poured into the firft bottle, and two pounds of diftilled 

 water into the fecond. Fire was placed under the mixture, 

 and augmented gradually till the entire difengagement of the 

 A11 the gas was muriatic acid gas, which was totally abforbed by the oil. The 

 abforbed. latter exhibited the following phenomena: it became at firft 



Changes of the ^ & c j tron co ] ourj an d afterwards brownifh, which grew gra- 

 dually darker towards the end of the operation ; it retained its 

 transparency ; it grew very hot; its volume augmented about 

 a tenth; the fides of the bottle were covered with fmall lim- 

 pid drops which united flowly at its bottom, in the form of a 

 thick oil. 

 Cryflalline pro- Left to itfelf for twenty-four hours, it formed a mafs of ir- 

 du& by repofe. regular cryftals, from which ran a brown liquid. When dried 

 and ftrongly prefTed between meets of paper, this cryftalline 

 matter was very white, and of a peculiar odour, participating 

 of the oil and the acid made ufe of; it weighed twenty-four 

 ounces. 

 Moie cryftals The liquor which had been feparated from thefe cryfials, 



by cold. expofed in a cellar for feveral days, yielded others, which dried 



like the firft, were of equal whitenefs, and weighed four ounces. 



To 



