Copy letter from Robert William Frederick Harrison to Miss A S Lawrence, 44 Westbourne Terrace, W 'With reference to your letter of July 17, Professor Pearson has not himself lately read a paper before the Royal Society on the subject that you mention, but the following papers on similar subjects have been published recently:- E C Snow. On the determination of the chief correlations between collaterals in the case of a simple mendelian population mating at random. Proceedings [of the Royal Society], No. B 561. Price 7s 0d.' S M Jacob. Inbreeding in a stable simple mendelian population with special reference to cousin marriage. Proceedings, No. B 568. Price 3s 0d. The numbers of the Proceedings containing these two papers may be obtained of Messrs Harrison & Sons, 45 St Martin;s Lane, WC.' 18 July 1911