C. U. C. p. ALUMNI JOURNAL 



109 



and tincture of opium may be valued in 

 the same manner, using about 3 grammes 

 of the extract and about 75 mils of the 

 tincture. 



Valuation of Mustard. 

 For this purpose Penau, Rep. Pharm , 

 suggests the following method of pro- 

 cedure: 5 grammes of the mustard to 

 be valued are placed in a retort, 100 mils 

 of distilled water added, and the whole 

 allowed to stand for a period of about 

 six hours, at room temperature. Then 

 add 26 mils of alcohol, and 26 mils of 

 olive oil. The mixture is then subjected 

 to distillation on a glycerin-bath, and 90 

 mils of distillate collected in an Erlen- 

 meyer flask, containing 10 grammes of 

 5 per cent, ammonia. Care must be 

 taken that the delivery tube extends well 

 into the ammoniacal liquid. 20 mils of 

 tenth-normal silver nitrate \'. S. are 

 added to the distillate and the whole set 

 aside for twenty-four hours in a dark 

 place. The mixture is then passed 

 through a Joulie filter, washing with dis- 

 tilled water and adding, drop by drop. 

 nitric acid until the liquid shows a de- 

 cided acid reaction. The excess of silver 

 •nitrate is precipitated by addition of 10 

 per cent, hydrochloric acid, and after a 

 period of rest extending over twenty- 

 four hours the precipitate is collected on 

 a double-tared filter. After drying and 

 weighing the proper calculations are 

 made. 



Resins of Pinus Brutia and Pistacia 

 Terebinthus. 



The resins from both plants, as they 

 appear in commerce have been subjected 

 to a critical examination by L. Reutter. 



The resin obtained from Pinus Brutia 

 appears in the form of brownish-yellow, 

 brittle masses, possessing a turpentine- 

 like odor. It is very soluble in acetone, 

 alcohol, ether and chloroform, and less 

 soluble in oil of turpentine, benzene, 

 toluol, carbon disulphide and petroleum 

 benzine. LTpon distillation it yields an 

 oil containing borneol. 26.55 grammes 

 of the resin consisted of 3.5 grammes of 

 resin acids, soluble in ammonium car- 

 bonate; 8.5 grammes of resin acids, sol- 

 uble in sodium carbonate; 4.2 gramm,es 

 of volatile oil, 3.90 grammes of resin 

 and 6.45 grammes of woody fiber. 



The resin obtained from Pistacis 

 Terebinthus appears in the form of 

 masses possessing a balsamic, turpen- 

 tine-like odor, the exterior being hard, 

 and the interior of the masses much 

 softer in consistence. When viewed un- 

 der the microscope numerous needle- 

 shaped crystals are seen, which are very 

 soluble in ether. About 75 per cent, of 

 the masses is soluble in either alcohol 

 or oil of turpentine, but they are almost 

 entirely dissolved by chloroform, am- 

 monia water, solution of potassium or 

 sodium, hydroxide and carbon disulphide. 

 Ether or petroleum ether are poor sol- 

 vents. 172 grammes of the resin con- 

 tained 17.6 grammes of volatile oil, 3.6 

 grammes of resin acids soluble in am- 

 monium carbonate, 63.5 grammes of 

 resin acids soluble in sodium carbonate, 

 25 grammes of acids soluble in solution 

 of potassium hydroxide, 45.9 grammes 

 of substance readily saponified, ;i.6 

 grammes of ether soluble substance and 

 12.8 grammes of woody and mineral 

 matter. 



