196 IV. OILY COMPOUND COMBUSTIBLES.— 



carry on the distillation of the other part. Used as a powerfully 

 antiseptic but coarse varnish, to light fires, and as a summer fuel. 



American green tar. From Pinus palustris, which has 

 been exhausted of its rough turpentine by incisions for three or 

 four years. 



American light wood tar. From pini palustres that 

 have fallen in the woods through age. 



French tar, Goudron de Bordeaux; From P. maritimus. 



HuiLE DE cade, O. cadinum. From Juniperus oxycedrus; 

 used as tar. 



Oil of tar, JeraUy Oleum pini, O. tcsdcc. Obtained by dis- 

 tilling tar ; soon thickens of itself, almost to a balsam. 



Oil of bricks. Oleum lateritium. From olive oil, mixed with 

 brick-dust, and distilled ; very resolvent, useful in palsy and 

 gout. 



Oil of wood-soot, O. fidiginis. Fetid, used in epilepsy. 



Oil of box. Oleum buxi, P. L. V. From box-wood, by dis- 

 tillation, without addition; resolvent. 



Pyroligneous tar. Wood tar. Obtained in distilling and 

 rectifying pyroligneous acid ; will not unite with common pitch 

 and tar. Used as a varnish. 



Oil of Benjamin, Oleum benzoini. Obtained by distilling 

 by a strong fire the residuum left after making flowers of benja- 

 min, used in making an imitation of Russia leather. 



Creosote. The following observations have been abridged 

 from Dr. Gully's translation of Magendie's Formulary. 



This is an oily, colourless, transparent liquid, of a pene- 

 trating odour, resembling that of smoke, or smoked meat, and 

 of a burning and exceedingly caustic taste; its sp. grav. is 

 1'037. Preparation. — In the dry distillation of tar from wood, 

 the fluid collected in the receivers contains an empyreumatic 

 acid water, which is rejected, and oil of tar, which is placed in 

 glass retorts and rectified. In these two distillations the oil of 

 tar is at first light, but as the heat is increased its gravity aug- 

 ments. At one period of the process the oil sinks to the bottom, 

 and a fluid which is poor in creosote, and consists mostly of 

 eupione, and other substances that interfere with the purity of 

 the creosote, floats above it. This is poured off', and the pale 

 yellow tar-oil is heated ; carbonate of potass is added, until the 

 carbonic acid is no longer disengaged on shaking. The mixture 

 is decanted, in order to separate the acetate of potass, and the oil 

 is again distilled in a glass retort, and all the first products that 

 float on the water are rejected. The oil is then dissolved in a 



