Copy letter from Robert William Frederick Harrison, to Professor [Charles Scott] Sherrington, Fellow of the Royal Society The paper by Professor J S Macdonald on 'Man's mechanical efficiency' was referred to the Physiology Committee and dealt with them in the usual way. They had before them some critical remarks by a distinguished physicist upon the mathematical and physical portions of the paper, and they though that before recommending the paper for publication the author should have an opportunity of reconsidering it in the light of these criticisms. 14 July 1914