Copy letter from Robert William Frederick Harrison, to Dr E W Marchant, Blythswood Laboratory, Renfrew, N.B. In reply to Marchant's letter of the previous day, Harrison now sends the manuscript of the paper by Lord Blythswood and Marchant, in order that the suggested modifications might be carried out. The name of the referee whose criticisms were forwarded to Marchant, was Dr J H Gladstone of 17 Pembridge Square, London, W. 14 October 1899