The idea of writing memoirs was dismissed in favour of the more elaborate form, and in November 1855 the first two volumes of his uncompleted History of Philip II.
Galgano (infra), built in black and white marble, was begun in the early years of the 13th century, but interrupted by the plague of 1248 and wars at home and abroad, and in 1317 its walls were extended to the baptistery of San Giovanni; a further enlargement was begun in 1339 but never carried out, and a few ruined walls and arches alone remain to show the magnificence of the uncompleted design, which would have produced one of the largest churches in the-world.
For many years he devoted his leisure to Greek studies, and in1850-1857he published five volumes of a Critical History of the Language and Literature of Ancient Greece, which, though uncompleted and somewhat antiquated, is still useful.
It is preceded by a rich portal in the Gothic style with elaborately carved doors, and is flanked on the north by an uncompleted tower.
He was the first to attempt a comprehensive treatment of all invertebrates from the genetic point of view; but unfortunately his great work, entitled Die Stcimme des Thierreichs (Vienna and Prague, 1889), was uncompleted.