TRAUGOTT SANDMEYER, well known to all chemists as the discoverer of the reactions which bear his name, was born at Wettingen in Aargau in 1854. Left an orphan by the death of his father the day after his birth, his mother had to resume her former occupation as a school teacher. His father, who was a science teacher, left a library of scientific books, the perusal of which led young Sandmeyer to interest himself in scientific apparatus, and after spending some time in an engineering workshop, entered the employment of Mr. J. F. Meier, of Zurich, a manufacturer of physical apparatus. Sandmeyer afterwards started business on his own account, and supplied apparatus to the Polytechnic institution. He became in this way connected with the staff of the institution, and in 1882 was appointed lecture-assistant to Victor Meyer.