DR. DONALD H. A. HUTCHINSON, a master of the art of photomicrography, died of cancer on Feb. 1, at the age of fifty-six years. An ardent naturalist all his fife, he concerned himself latterly with the photography of living microscopic animals by means of both still and moving pictures. Many will remember the remarkable films of protozoan life which he exhibited at the Zoological Society of London in 1924 and at the British Association meeting at Oxford in 1926; but only his intimate friends will know of the amount of his work and of the patience and ingenuity with which it was achieved. It was work carried out in the spare moments of a busy general practice. He never sought publicity, but hoped eventually to produce an atlas of photographs of as many kinds of protozoa as possible. He was always trying to get better and still better results.