|Alternative reference number||NLB/53 p71|
|Title||Copy letter from [Robert William Frederick Harrison], Assistant Secretary of the Royal Society; to Sir [Joseph John] Thomson, O.M., PRS, Holmleigh, West Road, Cambridge|
|Date||14 April 1916|
|Description||'Dear Sir Joseph,|
Since you were here this morning Mr. Barcroft has been in with the enclosed vivisection certificates to which he is anxious to have your signature. He begged me to send them on to you officially on behalf of the Physiology War Committee, and to ask if you would sign them (each in two places as marked), and send them on to him at 13 Grange Road, Cambridge'.