| Description | Letters to Pearson from Latter of the Charterhouse School, Godalming. Letters dated 1900-1901 regarding Oswald's research into Cuckoos, eventually published as "The egg of Cuculus canorus : an enquiry into the dimensions of the Cuckoo's egg and the relation of the variations to the size of the egg of the foster-parent, with notes on coloration etc.", <i>Biometrika</i>, (1902). Letters dated 1907-1908 regarding Oswald's collection of and research on bees and wasps; and Pearson's comments on Oswald's paper. Letters dated 1911-1913 regarding breeding wasp specimens; conducting observations and measurements on pupils at Charterhouse School; and his typology of wasp faces. |