The works of Aldrovandi form thirteen folio volumes. Of these, four only were published by himself; namely, three on birds and one on insects. Immediately after his death, in 1606, his widow put forth a volume on the other white-blooded animals, including testacea and crabs. Cornelius Uterverius, a native of Delft, and his successor in the institute of Bologna, revised the work on fishes and whales, which appeared in 1613, as well as that on the quadrupeds with solid hoofs, published in 1616. In 1621, the History of the Quadrupeds with split Hoofs was edited by Thomas Dempster, a Scottish gentleman, who was also a professor at Bologna. The other treatises, on the viviparous and oviparous digitate quadrupeds, on serpents, monsters, and minerals, were prepared for the press by Bartholomew Ambrosinus, another of his successors, and that on trees by Ovid Montalbanus. These works underwent a second impression at Bologna, and some of them were subsequently printed at Frankfort. It is difficult to procure a uniform edition, and some of the tracts are much rarer than others. Aldrovandi was certainly one of the most zealous naturalists of his time; but, although he added considerably to the stock of information, he can only be considered as a laborious collector of materials. Cuvier pronounces his works "an enormous compilation without taste or genius," and agrees with Buffon in thinking, that were the useless parts removed, they would be reduced to a tenth of their bulk. Moreover, the plan and matter are to a great extent borrowed from Gesner; but in all ages writers on natural history have been so much addicted to the practice of borrowing, that Aldrovandi is hardly to be censured on this account. Some portions of his museum have successfully struggled with the destructive energies of time, and are still to be seen in the collection of the Institute of Bologna. His manuscripts, of which there is an immense mass, are preserved in the public library of the same city; and the drawings from which the engravings for his work were taken were carried, at the time of the Revolution, to the Museum of Natural History at Paris.