Viii PEEFACE. 



lopods, are described ; then the crustaceans, testacea, echi- 

 nidaB, aseidians, actiniae, hermit crabs, insects. In the eighth 

 chapter the organs of sense are considered, and afterwards, 

 the voice, sleep, age, and differences of the sexes in animals 

 are described. 



BOOK Y. In the former books animals are for the most 

 part described with reference to their several parts. In the 

 fifth book they are treated as entire, and especially with 

 regard to their mode of reproduction. First of all, our 

 author treats of spontaneous reproduction, and then of 

 those animals which spring from a union of the sexes ; and 

 from this he proceeds to some detail with respect to 

 different groups of animals, testacea, Crustacea, insects. 

 The book concludes with a long description of bees and 

 their habits. 



BOOK YI. In this book the same subject is continued 

 through the several classes of birds, fish, and quadrupeds. 

 This account of the reproduction of animals includes also 

 the consideration of the seasons, climates, and ages of 

 animals, and how far these influence their reproduction. 



BOOK YII. The seventh book is almost entirely devoted 

 to the consideration of the reproduction of man, and an 

 account of man from his birth to his death. This book 

 ends abruptly, and is probably imperfect. 



BOOK VIII. In the eighth book Aristotle passes on to 

 the most interesting part of his work, the character and 

 habits of the whole animal world, as it was known to him. 

 The amount of detail which he has collected and arranged 

 on this subject is most interesting. He treats, first of all, 

 of the food of animals, of their migrations, their health and 

 diseases, and the influence of climate upon them. 



BOOK IX. The subject of the eighth book is continued, 

 with an account of the relations in which animals stand 



