Where are data concerning Picric acid to be found ? In Allen's Encyclopaedia ; N. Y. Journal of Homoeopathy , Vol. II ; North Am. Journal of Homoeopathy , Vol. XXIII ; Am . Hom. Observer , Vol. XIV ; see, also, Homoeopathic Times , April, July, 1878. What is Picric acid ? It is an organic acid compound of Nitric acid and a member of the Phenol series. How is it prepared ? One part, by weight, dissolved in 99 parts of distilled water. Drug power, 1/100. Triturations of the pure acid. What is its general action ? It corresponds in general to symptoms of neurasthenia or brain fag. It also has a marked action on the sexual organs. Its power of disintegrating the blood, and of destroying the properties of the red blood corpuscles alleged by its chief prover has been disputed. Give its indications in neurasthenia. Depression and weariness from slight fatigue, a mental inactivity with indifference and a desire to lie down and rest : brain fag ; the grand characteristic is that the slightest exertion brings on speedy exhaustion, and extinguishes that quality which we call grit. What are the sexual symptoms of Picric acid ? Excitement, priapism and profuse emissions, erections very violent, legs are heavy ; there is prostration from least exertion ; erections keep the patient awake at night. The higher potencies are better than the lower here.