iy he, solute and he one. ps =e per ‘cent. er 
total solution. In this way the, values for camphor « | 
established, and checked by control PApCHGENES which then 
- tables drawn up by Wratschko. s/c 
Ubsoths: water; sortigk were found for Se ae 0 9853 ae ‘to O ian 
According to Utz, who ‘was able to prove the ‘utility. of ‘the refra m ric mi thor 
by his own investigations, the process is suitable for the estimation of the 
solutions of natural as well as of artificial camphor, and is. - specially 
only a few drops are used in the pepecss ae 
; 
estimation of nym The method rests upon the formation. of tHe: cee 
and is similar to the age estimation worked out a8 Kremets and 
with 10 cc. of a normal alcoholic eee CT aiithoul and: then titrated wikis normal s 
acid. The neutral solution is shaken up with chloroform, added in successive 
of 15, 10, 10, 10 cc. From the polarisation of the chloroform. extract. in a 100 mm. 
the menthol content is calculated with the aid of the formula: Tae Rei ahs vein 
Per cent. menthol = angle of rotation >< 25. a 9 rae x< 100. : a a “ 
with water to 100 cc. 90 cc. of this were distilled off. “The distillate. “contains 
whole Gt the yao acid, which is Seen a oe with 55 9 MOH. 
a ng 
2) Cf. Report October 1912, 159. — 
59. As per Perfum. Record 10 (1919), 199. — 
p. 594. — 5) Chemist and Druggist 91 ecke) 828. 
38 (1919), T. 325. | 
