Formic Acid. Hcho2.

An acid first discovered in the red ant (Formica rvfa), but easily prepared artificially by various processes.

It may be obtained pure from the operative chemists.

Homoeopathic uses. - A few pathogenetic effects are recorded in the British Journal of Homoeopathy, vol. ii., p. 338. It seems to act on the kidney.

Preparation. - Solution in distilled water for lx, dilute alcohol for 1, and rectified spirit for 3x and upwards.