It becomes especially difficult henceforward to follow the history of his studies. The literary friends of this part of his career; his colleagues in the University ; Ranzani; Caturegli, the astronomer ; the eminent botanist, Felippo Re ; his fellow-pupil and fellow-teacher, Clotilda Tambroni; Schiassi; Magistrini; and others of less note, who could have supplied information, not only as to his habits and pursuits, but as to the actual stages of his progress, are long since dead.