Referee's report by Herbert William Richmond, on a paper 'Cremona transformations of space of four dimensions by means of quadrics, and the reverse transformations' by J G Semple Sectional committee: Mathematics Recommended for publication in Philosophical Transactions, in full. The paper should be separated into chapters and a table of contents should be added. [Published in Philosophical Transactions A, 1929]. Endorsed on verso as received 24 January 1929. January 1929