During the two years preceding the outbreak of war, Dr Hindle was engaged in researches on the biology of lice. Soon after the war began he joined the army, leaving his notes with me. He has now been in France for over a year and is serving as Captain in the Royal Engineers. An abstract of his work has been set up in type for many months for publication by the Local Government Board but his contribution has been withheld unavoidably through a desire that it should be supplemented by further work which has since been conducted in the Quick Laboratory.