Persian Powder, a substance consisting of the dried and pulverized flowers of the py-rethrum carneum and P. roseum, which is reputed to be very efficacious in destroying insects, and is extensively used in Persia, Turkey, and Russia. The plant is a native of the Caucasus, and bears a composite flower, which is gathered wild and sent chiefly to Tiflis for manufacture. It was introduced into France about 1850. Since then M. Willemot has procured the seed from the Caucasus and has raised the plant in England; and as the species thus raised differs from any previously known, it has been named pyrethrum Willemoti. Although destructive to insects, it is said to be harmless to man. It is stated by Prof. Lan-derer in a scientific periodical (April, 1874) that the common oxeye daisy, chrysanthemuhi leucanthemum, has long been employed in Dal-matia for preparing a powder like the Persian, and that both this and C. segetum are now largely used in Germany as a substitute, and found particularly effective against parasites in sheep and cattle.