May 2.

Demonstrative Proof.

It is noticed in the journals of May, 1817, that in the preceding summer, Mr. J. Welner, a German chemist, retired to his house in the country, there to devote himself, without being disturbed, to the study and examination of poisonous substances for the purpose of producing a complete “Toxicology,” established by undeniable proof. He tried his poisons upon himself, and appeared insensible to the great alterations which such dangerous trials produced upon his health. At the latter end of the month of October, he invented some unknown poisonous mixture; and wished to be assured of its effect. The following is the account which he gives of it in the last page of his manuscript:—“A potion composed of—(here the substances are named, and the doses indicated)—is mortal; and the proof of it is—that I am dying!