| StorageSite | UCL Special Collections |
| Level | Item |
| Reference Number | PEARSON/6/15/4/2 |
| Title | Letters from Charles Claud Twort |
| Date | Jun 1931 - Sep 1931 |
| Description | Letters to Karl Pearson containing background details and methodology to experiments on the carcinogenic effect of oils and tars used in the cotton industry on mice; enclosing census data on mice kept in their animal house, and tabulated data on the time it took the tumour to arise according to the mouse colour; about the source of mice used in experiments and any congenital defects; enclosing a record of tumours in 5000 mice painted with shale oil from a 1918 experiment; and about the change to malignancy in 4000 tumour mice, and death rates. |
| Extent | 6 letters plus enclosures |
| AccessStatus | Open |
| AccessConditions | The papers are available subject to the usual conditions of access to Archives and Manuscripts material, after the completion of a Reader's Undertaking. |