the picture on the Endo-plate. 
least 30 Ibs. per acre. The oil contains about 70 per cent. of phenols, chiefly thymol 
to be inexact and he maintains the reliability of his own method. == ee, 
test, we obtained indifferent results only. 
_rischen Ole, 254. ed., vol. Ill, page 494. — *) Deutsche Parf.-Ztg. 1 (1915), 187; Report October | 
4) Deutsche Parf.-Ztg. 1 (1915), 288. — 5) Deutsche Parf.-Ztg. 1 (1915), 289. —— °%) ee 
It is- evident that in this respect ‘hymol 
charcoal are useful, but more especially so in cOmDia 
& 
known there by the name of horsemint. Many years’ ago the Department und 
cultivation experiments in this respect with this plant which grows wild on ee sa 
Piscensin, Kansas, and Texas. 
will flourish in the cultivated state as well. Whether cultivation will pay will ee 
on local conditions. In the distillation of the plants an average yield of about 201 
of oil per acre may be expected; in subsequent years the yield should, amount to 
Consequently an acre should yield about 13 lbs. of thymol the first year and about Be 
20 Ibs. in subsequent years. A Monarda plantation will stand five years and more; 
but cultivation would only pay if at the same time other aromatic plants were gee ; 
tivated, thus making it worth while to invest in a distilling plant. ; 
Vanillin. The titration method in the examination of vanillin, proposed ~ 
J. F. Sacher’) is attacked by M. Lehmann‘) who points out that it is incorrect to 
assume that all the vanillins of commerce are one and the same homogenous body. 
Very often one has to deal with a mixture of isomerides and for such products — 
Sacher’s titration method would invariably find 100 per cent. of pure vanillin. The 
presence of by-products of the same molecular weight, and behaving in exactly th 
same way to alkalis, is not detected by Sacher’s method. Lehmann also holds it to 
be possible that additions of salicylic, benzoic or phthalic acids could be graduated - 
by means of a second addition, indifferent to alkalis, so that titration with alkali wou 
yield apparently 100 per cent. of vanillin. In a mixture of 61 g. of benzoic acid wi 
76 g. of vanillin and 15 g. of acetanilide, which mixture consequently contained but 
50 per cent. of vanillin and 50 per cent. of adulterants, Sacher would find 100 per c 
of pure vanillin according to his method. Finally Lehmann points to an error of ca 
culation in Sacher’s paper. Sacher admits the error, but points out in his reply®) thai 
an isomeride such as fi. isovanillin, would be out of the question as an adult 
because of its being too expensive, and that it was but a technical impurity. Fur 
more he critisizes Lehmann’s method of determining the melting point which he dec 
We mentioned already in. our last Report") that in putting Sacher’s method 
1) Bulletin 372; Americ. Journ Pharm. 88 (1916), 287. — %) See Gildemeister und Hoffmann 
