Minutes, meeting of the Chemistry Sub-Committee Sir William Ramsay in the chair. Committee business, including Ramsay's report 'that he had examined 5 samples of gas, none of which contained a trace of Heluim'; a report from Sir Henry Jackson that aviators were satisfied with the present explosives and thus no need for further experiment with zinc ethyl; a letter from Dr Hewitt on the use of explosive balloons; a request that Dr Beilby report on the use of sodium as explosive; a report on experiments 'with certain irritating vapours'. p8. 3 February 1915