Referee's report by Alexander Craig Aitken, on a paper 'A purification method for computing the latent columns of numerical matrices and some integrals of differential equations' by Lewis Fry Richardson Sectional committee: Mathematics Recommended for publication in Philosophical Transactions, The paper is original in matter and presentation. To modify it would be a 'heavy task' and it should be published as it stands. [Published in Philosophical Transactions A, 1950]. Date received not given. 1949