to produce short documentaries on natural history. He helped in the production of several short films dealing with insects including one on wasps and another on tiger beetles in a series called Secrets of Nature. Death Lefroy once became unconscious in March 1925 while experimenting in his laboratory on poison gases to control houseflies. He was administered oxygen for an hour before he became conscious and returned to work in April. He was however unlucky and killed by poisonous fumes in a laboratory accident in October 1925. He had become unconscious once and after recovering, he had returned to his laboratory. He was found dead on the 15th of October after his wife alarmed at his absence went to the laboratory. It was estimated by the postmortem that he died at 6.35 PM on 14 October 1925. He had been trying out various gases to kill the larvae of houseflies (his biographer, Laurence Fleming, suggests that his hatred for houseflies may have to do with the death of his son. He also notes that Maxwell-Lefroy may have been suffering from cancer and that there had been suggestions that his death could have been a suicide.). His assistants including Olive Lodge had no knowledge of the composition of the poison gas. It is thought that he was experimenting with Lewisite. He was buried in Kensal Green cemetery. His position at the Imperial College was taken up by Balfour Browne who ensured that the flasks with unknown chemicals that Maxwell-Lefroy was working with were buried. Family Maxwell-Lefroy and Kathleen had three children of whom the first, Gladys Kathleen died in infancy, and the second, Charles died in November 1910 while he was in Pusa and was the cause for his premature exit from India. The only child who survived was Cecil Anthony (d. 1995) who became a general manager of Burmah Oil Company and was later made CBE. He wrote an unfinished memoir on the life of his father which was posthumously edited as a biography published in 2015 by Laurence Fleming. Kathleen died on 4 December 1967. Publications Maxwell-Lefroy published numerous journal articles and memoirs published by government departments. Some of the major books include: Indian Insect Pests (1906) - a Bengali edition was produced with assistance of C.C.Ghosh Trials of the South African Locust Fungus in India (1907) Maxwell-Lefroy, H. 1909. Indian Insect Life: a Manual of the Insects of