Correspondence with Sir Francis Galton, Herbert Thompson, Prof. W. F. R. Weldon and F.B. Stead concerning Weldon's report on the study of variability in 7000 young female crabs published in the Proceedings of the Royal Society London 57, 1894. Bateson requested clarification on various issues in the study which could have had an impact on the results. Includes incoming letters and both draft and fair copies of letters sent by Bateson.