Letters Concerning on Data Gathering <p>Consists of :</p> <li>covering letters that accompanied papers on collateral hereditary investigations. Letters from G Cecil Fry, Caroline Herford, Mabel Bell, J Parkinson, W Bridge, Ernest Linder, C Wragg, J Fairguire, J Evans, Herbert Watts, J Rowlands, James Allan, J Corrigall, P Hood, W Sargart, W Abbott, Charles Chambrie (mainly schoolteachers).</li> <li>copy of covering letter sent by Karl Pearson, printed directions and recording forms to investigate collateral heredity investigations. </li> 1899-1902