368 A COMPENDIUM OF 
Oleum Picis Liquidez, Tar Oil.—A volatile 
oil, distilled from the tar of commerce. When 
first obtained, almost colorless, but on standing 
becomes brown and less limpid. The odor is 
strong and tarry; taste, acrid and tarry; specific 
gravity, about 0.97. The oil has all the medi- 
cinal virtues of the tar, and the advantages of 
being less bulky and offensive to the taste. 
Like the tar, it is stimulant, diuretic, and dia- 
phoretic in its medicinal effects, and may be 
given in doses of 3 to 6 drops (0.18 to 0.36 
gram). 
Oleum Pimentz, Pimento Oil, Allspice Oil. 
This volatile oil is distilled from the fruit of the 
Eugenia Pimente.— Natural order Myristi- 
cacee. Like many of the other oils, when 
first distilled it is almost colorless, but by age 
and exposure it becomes brown and less limpid; 
Specific gravity 1.37, and when dropped in 
water it sinks, It is the heaviest of the vola- 
tile oils. The oil resembles that of cloves in 
odor and taste, except in being a little less 
pungent. It consists of two distinct oils—one 
lighter, and the other heavier, than water; the 
former a pure hydrocarbon, and the latter 
forming crystalline compounds with the alka- 
lies, and therefore may be termed eugenic or 
pimentic acid, for it is identical in every re- 
spect with the eugenic acid found in the clove 
oil, The oil, medically, is an aromatic stimu- 
lant, and may be given in doses of 3 to 6 drops 
(0.18 to 0.36 gram), but is not often given 
alone. It forms an ingredient in the officinal 
preparation of the Spiritus Myrcee. 
