THE memory of Liebig is also revived by an article, accompanied by a reproduction of a daguerreotype of five of his assistants, contemporaries in his laboratory at the University of Giessen, all of whom were pioneers of chemistry, which appears in the Times of Sept. 5. Three were German—Hofmann, Fresenius, and Will—and two were English—Gardner and Bullock, who were associated in 1845 in the foundation of the Royal College of Chemistry, of which Dr. Gardner was secretary and Hofmann the first professor of chemistry. That three of the chemists associated with the Royal College of Chemistry in its early days should be included in a single photograph will be of special interest to past and present students of the Royal College of Science, its lineal descendant. “Ninety years ago”, says the writer of the article, explaining the picture, “five young men met for a solemn function. … They met to be photographed.” He gives a list of the distinguished chemists trained by Hofmann at the College, of whom Prof. H. E. Armstrong survives.