International Catalogue of Scientific Literature, 



m ZOOLOGY. 



EXPLANATORY. 



OwiNv> to the great extent of Zoolog-y, and the consequent 

 specialisation that occurs among-st its workers, and because also 

 of the desire that parts of the Zoological Catalogue shall be 

 complete each one in itself, it has been found necessary to divide 

 Zoology into " Branches." These Branches, though primarily 

 determined by the natural divisions of the animal kingdom, do 

 not entirely correspond therewith, because of the great difference 

 in the extent of the natural divisions. Some of these divisions 

 (Phyla, or Classes) are consequently treated together, while 

 others are divided into more than one Branch. When a 

 division of this kind is adopted, there is also a Branch in Avhich 

 the divisions are still treated together as one whole, viz., 

 Arthropoda, 2403-2431, and Yertebrata, 5203-o231. These two 

 Branches will include only works of a wide scope. Twenty-nine 

 Branches are adopted, under the numbers 0403 to 6031, and 

 there is also a comprehensive Branch numbered 0000-0231. 



The subject matter of Zoology proper (as distinguished from 

 the mode of arrangement of the animals alluded to above) is 

 arranged under eight heads (or great Subjects). These eight 

 Subjects all recur under each of the twenty-nine Branches 

 Each Subject is indicated by a number, the terminal two digits 

 of which are the same in every Branch. These great subject 

 will be found under 0203 to 0231. 



Each great Subject is divided into sub-divisions which are not 

 7iumbered. 



(n-8469) b 



