PREFACE. 



cordial co-operation on the part of the twenty-four libraries, the prepa- 

 ration of this Catalogue would have been impossible. 



Among those who have given assistance in the compilation, my 

 thanks are first due to Dr. W. A. K. Christie of the Geological Survey 

 of India, who has read through all the proofs and assisted me in many 

 other ways. Owing to his valuable help the work has gained greatly 

 in accuracy and completeness. 



I have also to thank Mr. J. Chapman, Librarian of the Imperial 

 Library, who has kindly solved several bibliographical questions that 

 presented unusual difficulty. Dr. G. D. Hope has checked the referen- 

 ces to Dutch periodicals and Mr. A. Kolusky those in Russian and 

 allied languages. Babu Balai Lai Dutt, the Society's Librarian, has 

 aided me in many ways. 



The cost of publication has been defrayed by a grant made by the 

 Trustees of the Indian Museum, through the kind offices of the Director, 

 Zoological Survey of India. 



The Society will be obliged if their attention is drawn to any errors 

 that may be detected. 



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