The handwriting on the letter was neat and feminine.
The copy, carefully corrected in his own handwriting, is preserved in the British Museum.
For a subsequent letter Calvin furnished (reluctantly, according to de Trye) samples of Servetus's handwriting, expressly to secure his conviction.
His handwriting was smooth now and his hand sure.
The rules which he laid down for himself, and which are still extant in his handwriting, prescribe sixteen hours a day of close application, and prove, not only the great mental power, but also the extraordinary physical strength he must have possessed, and for which indeed, during his residence at the university, he had been remarkable.