Copy letter from Francis Alexander Towle, Assistant Secretary, [the Royal Society], to Arthur Compton, Laboratoire de M. Bertrand, Institut Pasteur, Paris In reply to Compton's letter of 8 July, he assures Compton that his work as a Mackinnon Student was not found wanting. The third year is only awarded in exceptional circumstances, and Compton's case was not deemed sufficiently exceptional, having regard to other matters relating to the Studentships that Compton could not be aware of. The referee's comments noted that his work 'appears to have been done carefully and accurately'. 8 July 1921