Preface 



different sections occur. It has occasionally been found convenient, in order 

 to save repetition in printing, to group entries under a sub-heading which 

 is not contained in the International Catalogue Schedule. Where this has 

 been done the sub-heading is printed in italics. In some of these cases 

 the words of the sub-heading are understood to exist before the entries 

 following them, and consequently these entries commence with small letters. 

 These minor classifications, being often made mechanically on the basis of 

 the explicit mention of the sub-heading, are not to be taken as exhaustive ; 

 cognate entries may be found elsewhere under the same main heading. The 

 unit of classification is thus the complete numbered heading. 



The first portion of the present volume of the Index having been sent to 

 press before the whole of the material had been sorted, some slips belonging 

 to earlier sections were discovered during the arrangement of the later ones. 

 These titles have been placed in an Appendix under their appropriate 

 registration numbers. 



The following referees have assisted at various times in the preparation 

 of the Subject Index in Pure Mathematics : the late Professor J. D. Everett, 

 F.R.S., Mr R. J. Dallas, Miss Alice Everett, Mr R. Hargreaves, Miss W. M. 

 Hudson, Mr H. Knapman, Miss E. Perrin and Mr G. Harold Wilson. The 

 Committee is indebted to them for much valuable help. 



The arrangement of the contents of this volume for the press has been 

 made by Mr R. J. Dallas, M.A., of King's College, Cambridge. To him and 

 to Miss Brernner and the members of the Catalogue Staff thanks are due 

 for careful and conscientious work. 



At the request of the other members of the Committee, Mr G. B. 

 Mathews, F.R.S., examined the whole of the proof-sheets, and made sugges- 

 tions for their improvement : he was also consulted from time to time about 

 questions of arrangement, head lines and sub-headings. 



When the time for going to press approached, the Committee learned 

 with much satisfaction that the Syndics of the Cambridge University Press 

 were willing to undertake the complete risk of printing and publishing, as 

 regards both the Catalogue of Scientific Papers and the Subject Index. It 

 will be the care of the Committee, and it is hoped of the Scientific world 

 generally, to use their best endeavours that this public-spirited action shall 

 not result in financial loss. 



Finally the thanks of the Committee are due to the officials of the 

 Cambridge Press for their unfailing courtesy in the discharge of a complex 

 task. 



March 1908. 



viii 



