150 JONES'S COMPARATIVE ANATOMY. 



mical and physiological science, especially under the influ- 

 ence of microscopical observations, that a book never so com- 

 plete in 1841 could hardly be regarded as a guide in 1855. 

 It was, therefore, with pleasure that we saw announced a 

 second edition, as in its plan and general arrangement we 

 know of no other book so well adapted for the purposes of 

 the general student. A glance at the present edition indi- 

 cates that the author has added a considerable quantity of 

 new matter. The plates, which were excellent in the first 

 edition, have been increased from 330 to 398, and this even 

 does not indicate the number of new plates, as many of the 

 old ones have been withdrawn. The new matter, we find, 

 consists principally of additions amongst the descriptions of 

 the invertebrate animals, and of the history of their develop- 

 ment. The student will also find in the account of the higher 

 animals a very acceptable description of the homologues of 

 the vertebrate skeleton. Professor Jones excels in the art of 

 writing plainly and gracefully ; and his additional matter, in 

 point of style, is equal to anything in the original work. 

 Had it been consistent with the intention of the volume, we 

 should have been glad to have seen more of it re-written. 

 Some of the old matter is getting c[uite old, and references to 

 " recent " researches in 1841 should not have been left in an 

 edition of 1855. We also find some indications of haste in 

 the incorrect spelling and use of names. In spite of many 

 serious deficiencies, and the absence of much information, 

 especially with respect to the Protozoa and lower classes of 

 animals afforded by numerous recent researches, defects in 

 which Professor Jones's work is not singular, we can still 

 recommend his Outline as one of the best introductions to the 

 study of the animal kingdom that we at present possess. 



