has also supplied much useful additional matter in Chapter XI. 

 Mr. W. T. Blanford, F.R.S., has furnished me with several 

 valuable comments on the Geological Section ; Mr. H. F. Blanford, 

 F.R.S., kindly revised the Meteorology ; Sir W. "W. Hunter, 

 K.C.S.I., CLE., suggested some improvements in the brief chapter 

 on the Statistical Survey ; while Commander A. D. Taylor, late I.N., 

 and Commander A. W. Stiffe, late I.N., Colonel W. Barron, B.S.C., 

 Colonel W. J. Heaviside, R.E., Mr. E. Roberts, F.R.A.S., and 

 Mr. T. Gushing, F.R.A.S., have been obliging enough to give 

 similar aid in respect of the chapters dealing with Marine Surveys, 

 Revenue Surveys, Geodetic Observations, Tidal and Levelling 

 Observations, and the Supply of Scientific Instruments, respectively. 

 Colonel J. Waterhouse, B.S.C., Major H. Raverty, and Mr. Ney 

 Elias, CLE., have also given valued assistance in other ways. 

 Last, but by no means least, Dr. Jas. Burgess, CLE., has shown 

 great interest in, and supplied most useful information for the 

 Chapter dealing with Indian Archaeology, a subject in which he is 

 an eminent and acknowledged authority. 



My object has been to supply an outline sketch of the remarkable 

 labours achieved during the last fifteen years by the chief Indian 

 scientific departments, and to facilitate reference to the detailed 

 records of those services. Any possible success that may have 

 attended this effort is greatly due to the kind encouragement and 

 co-operation shown by the above gentlemen. 



CHARLES E. D. BLACK. 



London, October, 1891. 



