Letter from J A Craw, Physiological Laboratory, London Hospital, Medical College, Turner Street, to the Secretaries of the Royal Society Craw returns the corrected proof of his paper on 'The filtration of crytalloids and colloids through gelatine'. He sent a list through Dr Hill of headings for the index entries, and intends to send an order form for copies of the paper of which 450 are required in two days. 8 January 1906