XIV 



INSTRUCTIONS. 



The volume of Zoology contains : — 



(a) Schedules and Indexes in four lang-uages. 

 {b) An Authors' Catalogue, 

 (c) A Subject Catalogue. 



The volume is issued in two parts, but an extra title-page is 

 provided to be used if the two parts are bound up as one volume. 



The Subject Catalogue is divided into sections, each of which is 

 denoted by a four-figure number between 0000 and 9999. These 

 numbers follow one another in numerical order, but all the 9999 

 numbers are not used, for it is intended to fill up the gaps by interpola- 

 tion of such additional sections as may be required for additions to the 

 system of classification in future years. 



The general sections are 0000 to 0231. In the remainder of the 

 volume the first two figures indicate the group of animals dealt with, 

 e.g., 04 for Protozoa and 60 for Mammalia, while the third and fourth 

 figures have the same signification in each of the groups, e.g., 11 means 

 Physiology. 



To enable the reader to find these numbers quickly, the first or last 

 number on the page is repeated at the head of the page. In looking 

 up a subject, these numbers, which are called Registration numbers, 

 should be used instead of the ordinary pagination. These Registration 

 numbers serve to divide up the subject into sections, each of which 

 deals with related matter. 



In ever}'- section, except those in vv-hich the registration number 

 ends with the figures 31, the final arrangement of papers is in the 

 alphabetical order of authors' names. 



