Charcoals. 221 



Barbadoes tar, Pisseleon Indiaun^ Petroleum Barhadevsr^ 

 Bitumen^ Petroleum, Dark, very thick, semi-liquid ; found in 

 Trinidad and other places. 



Jew's pitch, Asphaltum. Pitch black, hard, strong-scented; 

 found in Syria and other places ; used in varnishes. 



Artificial asphaltum. Lett in distilling Barbadoes tar, 

 or coal tar. 



Amber, Succinum, Carabe, Found in Prussia. The whitest, 

 being the cheapest, is preferred for medical use; balsamic in 

 powder, 3J to 5J in gonorrhoea and the whites : the transparent 

 kinds are used in jewellery, and the coarser are distilled for &il of 

 amber; also used to make oil varnish. 



Oil of amber, Oleum succinic P. L. before 1809. Distilled 

 from coarse pieces of amber, which are not fit for jewellery ; 

 stimulant, antispasmodic, externally discutient, rubefacient ; used 

 in rheumatism, hooping-cough, and paralytic limbs. The fol- 

 lowing is recommended as a friction in tic doloureux^. — Olei succini 

 fl. unciam, tinct. opii fl. semunciam. Misce. Officinal prepara- 

 tions. — Spiritus ammonia? succinatus. 



Rectified oil of amber. Oleum succini rectificatum^ O. suc- 

 cinic P. L. since 1809. Oil of amber redistilled twice. 



Balsam or amrer, Balsamum succini. The thick oil left in 

 rectifying oil of amber. 



Oleum petrolii Barbadensis. Distilled from Barbadoes 

 tar by the retort, in a sand beat ; blue when viewed with the back 

 to the light, and orange when placed between the eye and the 

 light. 



Coal tar. Distilled from fossil coals ; used as a coarse cheap 

 varnish. 



Artificial musk, Moschus jiilitius^ Resina succini. Rectified 

 oil of amber one part, nitric acid four parts ; digest, a black matter 

 is dep(jsitcd, to be well washed in water : smell similar to that of 

 miisk or ambergris, and may be used for them in medicine. 



V. MMPLE COMBUSTIBLES. 



chaecoals. 



Charcoa l varies in its qualities according to the substance from 

 which it is prepared ; that of the soft wo<xls, as the willow or alder, 

 is best for crayons, and for making gunpowder; that of the harder 



