207 
Considerable attention is given to a consideration of the composition 
of dihvdrolaurolene and dihydroisolaurolene, two hydrocarbon deriv- 
atives from certain camphor derivatives. — Pharm. J., Lond., 1906, 
y. 22, pp. 157-161, 252-254. 
Riedel’s Berichte reports that carefully sublimed camphor melts 
at from 175° to 176°, and in an air bath at 177° C. — Riedel's Berichte, 
Berlin, 1906, p. 23. 
Weigel, G., points out that the Ph. Ndl. requires that camphor 
have a melting point of from 175° to 177°, and that a solution 1:10 
in alcohol, in a 200 mm. tube have an optical activity of -}-6.5 0 to 
7°. — Pharm. Zentralh., 1906, v. 47, p. 399. 
Evans Sons Lescher and Webb report that three samples of arti- 
ficial camphor from different sources simulated the appearance of 
natural camphor very well, but possessed a somewhat terebinthinous 
or saffrol-like odor. A slight stickiness was also noticed. One 
sample was found to contain a large proportion of halogen com- 
pound (chloride) when heated with lime. This was probably pinene 
hydrochloride. The other two were apparently free from chlo- 
rides. — Analytical Notes for 1906, 1907, p. 11. 
Weigel, G., reports finding camphor in cubes adulterated to about 
50 per cent with stearic acid. (From Apoth. Ztg.) — D. A. Apoth. 
Ztg., N. Y., 1906-7, v. 27, p. 129. 
The Ph. Brit. Committee of Reference in Pharmacy recommends 
giving a method for determining camphor in liniment of camphor 
and including a fixed minimum limit. — Chem. & Drug., Lond., 1906, 
v. 69, p. 864. 
In a police court case, in which the public analyst had found cam- 
phorated oil deficient in camphor by 33 per cent, the defendant’s solic- 
itor contended that no standard for the quantity of camphor which 
ought to be present is provided by the Ph. Brit. — Ibid ., v. 68, p. 92. 
Cowie and Dickson outline a method for determining the amount 
of camphor in camphor liniment, which consists in (1) determining 
the specific gravity of the liniment at 15.5° C., (2) taking the weight 
of liniment equal to 8 c. c. and placing in a weighed beaker, and (3) 
in a similar beaker placing an amount of olive oil equivalent to 8 c. c. 
The two beakers are placed in a sand bath and heated to 150° C. 
until constant in weight and then compared. The authors give the 
results of a number of experimental assays which seem to indicate 
satisfactory results. — Pharm. J., Lond., 1906, v. 22, pp. 281, 282. 
Lothian, John, still holds that the simplest method for determining 
the amount of camphor in camphor liniment is by heating in a shal- 
low flat-bottomed dish on a water bath. He asserts that in practice 
the behavior of the oil should be taken into account, as continued heat- 
ing may lead to an increase in weight. Olive oil itself, heated under 
