| RefNo | HD/12/1/31 |
| Previous numbers | 93HD.64.1 |
| Level | Item |
| Title | Copy Dale to Dr R O'Brien, Wellcome Physiological Research Laboratories |
| Date | 27 January 1927 |
| Description | He has seen Hartley's letter and knows that O'Brien realises how grateful they are for his help. However, they must face up to the question of how to fill out and dry materials not containing preservatives and yet keep them sterile without relying on assistance from other people |
| Extent | 1p |
| Format | Carbon copy |
| AccessStatus | Open |
| AccessConditions | OPEN - but with some restrictions |