only the history of his own time, but also the natural history of Persia and of India, and that probably with more accuracy than has been usually attributed to him. India he had not visited personally, so that he could only describe it from the information of others; but this implies that he was not alone in the studies which he devoted to natural objects. With such predecessors and aided by his own acute observations, we need not wonder that Aristotle produced a work which has ever been admired by naturalists, and must continue to rise in their estimation the longer it is in their hands.
The Index to the present volume has been formed on the basis of that of Schneider, and considerable pains have been taken to add as many names as possible from other sources, especially the Index of Strack, and Kiilb's recent translation of the History of Animals, both of which contain identifications of a great many animals. A few identifications have also been added from Liddell and Scott's Lexicon, as well as from Professor Bell's Catalogue of Animals in Captain Spratt's work on Lycia; and the cephalopods are named from Professor Owen's article on that class, in the Cyclopaedia of Anatomy. It is hoped, therefore, that the Index will be found to contain a greater number of suggestions for the identification of the animals mentioned by Aristotle than have been hitherto published collectively. It is also right to add, that it has been compiled after the translation was completed; and, therefore, in any differences which may be found between the identifications at the foot of the page and those given in the Index, the reader will rather prefer the latter, as the result of later research in works which were not accessible when the translation was made.
R. C.
