INTRODUCTION. 3 



Besides these there are two papers in Vol. XXVIII. of the Records 

 and one in Vol. XXIX., which have been incorporated in the following 

 memoir. 



The authorship, and more particularly the authority, of the 

 following memoir is necessarily composite. 



Aut meSr.° f the Where possible the authority for the state- 

 ments made is given, and in the case of the 

 chapters written by Mr. P. N. Datta and Mr. E. Vredenburg both 

 authorship and authority are exclusively theirs. The rest of the 

 memoir has been compiled by myself and is based on the reports 

 and surveys of the following officers of the Department, namely, 

 J. G. Medlicott, H. B. Medlicott, W. L. Wilson, F. R. Mallet, 

 C. A. Hacket, T. W. H. Hughes, H. Kane, T. H. Holland, P. N. Bose, 

 F. H. Smith, G. E. Grimes and Kishen Singh. In cases where more 

 than one officer has visited a place it has not been possible in every 

 case to quote the authority for a statement which may be a combina- 

 tion of the work of more than one person. As a general rule it 

 may be taken that statements made without qualification are the 

 result of my observations, or have been verified by me ; where they 

 are made entirely at second hand the name of the authority on which 

 they are made is always given. 



B 2 



C 3 ) 



