vi PREFACE TO SECOND EDITION. 



a really very complete index to the state of present knowledge. These 

 authorities write chiefly in foreign languages, and I need scarcely remark 

 that every modern anatomist must also be a modern linguist. Literature, 

 though not everything in Science, is yet indispensable, and as Professor 

 Rolleston observed in the preface to the first edition of his book (pp. viii- 

 ix):- 



' In some cases even the beginner will find it necessary to consult some of the 

 many works referred to in the descriptions of the Preparations and in the descrip- 

 tions of the Plates ; but the bibliographical references have been added with a view 

 rather to the wants indicated in the words " Fur Akademische Vorlesungen und 

 zum Selbststudium," so often prefixed to German works on Science, than to those 

 of the commencing student.' 



The debateable points of Phylogeny are not treated at any length. 

 Professor Rolleston, having tried one experiment, particularly desired that 

 they should be .omitted on account of the great space their adequate dis- 

 cussion must needs occupy. 



One alteration in the arrangement of the volume had been con- 

 templated by the Professor, but left unsettled, and has now been carried 

 out in consequence of the opinion of Professor Huxley in its favour. The 

 descriptions of the Preparations, those of the Plates, and the general 

 acc"ount of the Animal Kingdom, have changed places. The two former 

 stood last in the first edition, but take precedence in this. The new 

 arrangement tallies better with the order in which Professor Rolleston 

 wished the several parts to be studied, as stated, loc. cit. pp. vii-viii : 



' It is recommended that in all cases the study of the described Preparation 

 or specimen should precede that of the accounts in the Introduction (i. e. General 

 account of the Animal Kingdom, Ed.} of the Class and Sub-kingdom (i.e. Phylum, 

 Ed.} to which it belongs, and that the study of the Plates should be taken up only 

 after the attainment of a considerable familiarity with actual specimens by the 

 practice of dissection.' 



The Plates, however, illustrate the Preparations, and are therefore placed 

 as the second section of the book T . 



1 A few changes in the Preparations have been made. Some have been added, e. g. those 

 relating to the Rabbit ; the Privet Hawk Moth has been substituted for the Death's Head which is 

 difficult to procure ; similarly, the Dog's Tapeworm and its Cysticercus replace the Bladderworm of 

 the Sheep (Coenurus], The skeleton of the Common Fowl, two dissections of a Caterpillar, the 

 angular Sea Cucumber, and the Bugle Coralline, have been omitted. The Preparations were made 

 by Charles Robertson, Esq., Demonstrator of Anatomy in the University Museum ; the greater part 



