Essential Oils. 193 



a half; 61b. of fresh leaves yielded 5iijss ; and 4lb. dried yielded 



1 oz. and a half. This is stimulant and canninative, and has 

 been recommended in flatulence and anorexia. The dose is from 



2 to 4 minims on a lump of sugar. Officinal preparation, — 

 Infus. mentha? comp., D. 



Oil of milfoil flowers, Oleum millefolii. 18 baskets yield 

 4 oz. 3iiij ; I4lb. dry yield 3iij. 



Oleum Monaud.e, P. U. S. From M. punctata. 



Volatile oil of black mustard seed. Mix 10 kilo- 



frammes of the best black mustard powder with from 50 to 55 

 ilogrammes of water, and place them in an alembic, which is 

 connected with a double-bailed receiver : then distil. The vola- 

 tile oil condenses at the bottom of the receiver in the form of 

 brownish flakes. AVhen six litres of water have passed over, 

 change the receiver, or after that no volatile oil is deposited. 

 Pour oft* the superabundant distilled water, and rarefy the oil by 

 a naked fire in a small alembic. Thus it is obtained almost 

 colourless. When diluted with its own weight of alcohol, at 40^, 

 it is an excellent rubefacient, and acts almost instantaneously. It 

 may be substituted for the ammoniacal ointment. 



EssENXE OF myrtle, Oleuni essentlale imjrti. From the flowers 

 and leaves ; fragrant. 



EssEN'CE OF jonquil, Oleuiu mtrcissi. Used in perfumery. 



Oil of nutmeg. Oleum nucis jnoschatce stillatitium. From that 

 spice ; liquid, pale yellow : from Banda. 



Oil of thyme, Oleum orifjani. From the plant ; 2 cwt. fresh 

 yield 5 oz. and a half, 3^11). dried yield 5jss; stimulant, makes 

 the hair grow, caustic, used in toothach : irom France. — O. pe^ 

 trnselini. 



Oil of pimexto, 0. pimentce, 0,fructus myrti pimentce* From 

 allspice; stimulant. 



O. pimpinell.*:. From the roots of pimpernel ; blue. 



Oil of pexny-royal, O. puler/li. From the herb when in 

 fl9wer; 131b. yielded 5vj. 



Oil of raventsaiia. Oleum ravcntsaroR, From the leaves; 

 sold in Europe for oil of cloves. 



Oil of rhodii:)i, Oleum eliffuo rhodii. From Levant lignum 

 rhodium : 801b. yielded .^ix ; 8()lb. very resinous old w(K)d yieldcfl 

 ii oz. ; liffht, yellowish, but by keeping grows red : fmni the 

 Levant; tne oil of sandal-wood is sold for it. 



Oil ok roses, 01. msre. From the flowers of musk roses in 

 the cups split open, soaked in twice their weight of salt water for 

 several days, then distilled, and the water cohobatcd once or twice 



o 



