554 Scientific Proceedings, Royal Dublin Society. 
Some authorities make allusion to a discovery of diamonds in 
the bed of the Ganges, but I have failed to trace this statement 
to its source, and I am not in possession of any particulars. 
Lastly, about ten years ago, some small diamonds, stated to 
have been found in a hill stream near Simla, were forwarded by 
Sir E. C. Bayley to the Geological Museum at Calcutta. 
GEOLOGY. 
Although in the following pages I shall for each locality give a 
sketch of the mode of occurrence of the diamonds, it will be well, 
perhaps, by way of introduction, to give a general account of the 
formations which include the diamond-bearing beds, and likewise 
attempt to correlate those of the several localities respectively. 
Up to the year 1855 Indian geology wasin acondition of extreme 
confusion, for although much excellent work had been done, 
chiefly by amateurs, still it was, from the nature of the case, of a 
scattered and disjointed character, and the attempts at correlation 
of deposits situated at wide intervals had led to very erroneous 
conclusions, none of which were further from the truth, as now 
known, than those having reference to the diamond-bearing 
deposits. 
In the year 1857 a collection of geological papers on Western 
India, &<., with a summary of the geology of India generally, 
were printed by the Government, under the editorship of Dr. 
Henry J. Carter. Valuable as this publication was, its day is now 
gone by, and it is, therefore, to be regretted that it should still 
continue to be quoted, not only by discursive writers on India, 
but even in standard works on general geology. : 
The publications of the Geological Survey of India, as now 
constituted, which commenced to appear more than twenty years 
ago, have from time to time for different areas successively re- 
placed the confusion and incorrect correlation by an orderly 
arrangement based upon solid evidence. Erroneous conjectures 
and unsound hypotheses have been overturned by work of that 
kind, which, especially in a country like India, can only be 
accomplished by professionals, whose whole time can be devoted 
to the subject, and whose operations are systematized under the 
leadership of one central authority. 
