Referee's report by George Howard Darwin, on a paper 'Mathematical contributions to the theory of evolution.— IV. On the probable errors of frequency constants and on the influence of random selection on variation and correlation' by Karl Pearson and Louis Napoleon George Filon Recommended for publication in Philosophical Transactions, in full. The scope of the paper means that it should be put on record. The setting of the type in the paper will 'undoubtedly be troublesome' and the author should be asked to minimise the labour. Subject: Mathematics [Published in Philosophical Transactions A, 1898]. 2 January 1898