Allen collected a biographical account of the members of
Eton College, which by his will, dated 1753, he ordered to be placed in the libraries of the two colleges, and a third copy to be given to his patron, Christian Cronauer. He also compiled, in his leisure hours, or rather made collections for, an English dictionary of obsolete words, of words which have changed their meaning, such as
villain,
knave, and of proverbial or cant words, such as
helter skelter, which he derived from
hilariter celeriter. Allen's junior clerk, Thomas Sibthorpe, was bequeathed this manuscript material, Allen's law dictionary, and his law reports. ==References==