Varities.
Test for the purity of Olive Oil.—Dr. Ramon Codina Langlies, pharmacist in Barcelona, uses the following test for proving the purity of olive oil: 3 parts nitric, acid, spec. gr. 1.33, are diluted with 1 part of water. 1 grm. of this acid is added to 3 grm. of the oil; on the application of heat by means of a water-bath the color of pure olive oil becomes somewhat lighter, but acquires a red tint in the presence of benne oil; 5 per cent. of the latter are readily detected. The operation requires only 15 to 20 minutes, and the coloration remains un-changed for several days.—Journ. de Pharm.
Erythrocentaurin (see this Journal, page 207.) is, according to Méhu, contained also in the herb of Erythraea chilensis, Pers.—Journ. de Pharm., June, 1870.
