PREFACE 



IN the early part of 1897, my brother and I had arranged 

 to collaborate in writing a practical text-book of Elementary 

 Zoology, adapted more particularly to the requirements of 

 Students pursuing courses in the subject as laid down by 

 various examining bodies. We had, however, only reached 

 the stage of deciding on a general plan at the time of my 

 brother's death in November of the same year. 



The following are the chief points on which we had 

 agreed : 



i. To adopt the method pursued in Huxley and Martin's 

 Elementary Biology of giving a connected account of each 

 example. 2. To give brief practical directions which should 

 serve mainly as a guide, the student being able to refer, in 

 case of difficulty, to the descriptive accounts preceding 

 them. 3. In the larger animals, to arrange for as much work 

 as possible to be done on one specimen : there is much to 

 be said in favour of this plan apart from the fact that the 

 average student cannot give sufficient time to the subject 

 to dissect a fresh specimen for each system of organs. 

 4. To begin the course of instruction by an introductory 

 study of one of the higher animals ; to include in this in- 

 troduction the elements of Histology and Physiology ; and 

 to select the Frog for the purpose : after trying various 



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