Copy of a letter from R W J Keay, Royal Society to Dr J S Hart, Animal Physiology Section, Division of Biosciences, National Research Council, Ottawa, Canada HA Subcommittee of British National Committee for the IBP considered extracts from minutes of meeting of Committee on Standardization of Methods for the Measurement of Working Capacity held in Toronto from 8-10 October 1966 - welcome proposals - also noted plan for a population survey of Toronto children aged 10-12 years - think that 8-10 or 10-16 would be a better age range. 30 January 1967