12 INTKODUCTOEY. 



(13) K-epl VTZVOV nal eypyyopffsus, De Somno et Vigilia, On 

 Sleep and Wakefulness. 



(14) Tttpl ivuTTviuv, De Insomniis, On Dreams. 



(15) Kepi paxpopioTYiTos teal fipaxufSioTwros, De Vitce Longi- 

 tudine et Brevitate, l On Length and Shortness of Life. 



(16) T?J VEOTJJTOJ KM yypus, De Juventu et Senectute, On 

 Youth and Old Age/ 



(17) mpt- &m ymo-Eu*;, De Animalium Generatione, l On 

 Generation of Animals. 



Nos. 9 to 16, both inclusive, form the chief parts of the 

 so-called Parva Naturalia. 



The following are considered to be spurious, or at least 

 doubtful : 



(1) wept wojv xivww;, De Animalium Motione, On the 

 Motion of Animals. 



(2) trspi xotriAov, De Mundo, On the Universe. 



(3) Kepi xpupaTav, De Coloribus, On Colours. 



(4) vrepl &amp;lt;PUTUV, De Plant is, l On Plants. 



(5) T arpo/foa/tiara, Problemata, The Problems. 



Aristotle s works, as a whole, are characterized by 

 relevancy and methodical arrangement of subject-matter, 

 conciseness of expression, and simplicity of language. Many 

 parts of his History of Animals, Meteorology, Parts of 

 Animals, Respiration, Progressive Motion of Animals, and 

 Generation of Animals, illustrate these characteristics. 

 They clearly show his desire to state facts, or his own 

 opinions, in a plain way, there being but few attempts to 

 write in a highly polished style. 



The subject-matter of his works varies considerably in 

 interest. Many parts of the works referred to above furnish 

 very interesting reading, but some parts of his works are of 

 very little interest and even tedious, such as, for example, 

 many parts of Books iii. and iv. of his work on the Heavens 

 and Books iv. v. and vi. of the Physics. In his Aristotle, 

 &c., 1864, p. 143, G. H. Lewes expresses an opinion that 

 Aristotle s Generation and Destruction is in his most weari 

 some style of verbal disputation. It may be said, however, 

 that some parts of this work are very interesting, especially 

 the numerous passages in which Aristotle gives his views on 

 mixture, and what may be fairly called chemical com 

 position. Some passages of his works, even where the 

 subject-matter is simple, e.g., those in H. A. ii. c. 2, s, 6, 

 relating to the way in w T hich the feet of camels are divided, 



