Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to [Ernest Harold] Callow Esq.; Low Temperature Station, Downing Street, Cambridge Thanks [Ernest Harold] Callow for his summary of his paper 'The Velocity of Ice Crystallisation', but reminds him that abstracts must be under 300 words, and so returns the abstract, asking Callow to condense it to that length. 21 February 1925