Ransom and Foster have published a preliminary account of experiments on the life history of Ascaris lumbricoides in the Journal of Agricultural Research of 19th November, 1917. They found that a repetition of my experiments on the feeding of rats and mice with ripe Ascaris eggs gave results agreeing very closely with those recorded by me in the British Medical Journal of July 1st, October 7th and December 2nd, 1916, and in Parasitology of February 1917.