Copy letter from Herbert Rix, to Messrs Real Campbell & Company 'Dear Sirs, It has been suggested that it would be of interest to show at the May Soirée of the Royal Society the steel bottles containing liquid CO2 used for the aeration of waters. We understand that we are to communicate with you as you are interested in the matter. We shall be glad to hear whether you wll include these "gas drop" bottles among the scientific exhibits on that occasion. Yrs [Yours] truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 13 April 1896