578 Scientific Proceedings, Royal Dublin Society. 
latter mistake did not realise the existence of another formation 
close by from which the gems probably did originally come. They 
seemed to regard the diamonds both here and elsewhere through- 
out India as being a product of superficial deposits without refer- 
ence to the nature of the beds upon which they rested. 
When and by whom these mines were worked, and with what 
results, I cannot say, as I do not know of any published account 
of them. In the Central Provinces Gazetteer it is stated that 
“good sandstone and granite are obtained near the town; and 
mines of diamonds and rubies were formerly worked in the 
vicinity.” The examination of the geological structure of this 
neighbourhood, and a comparison of it with that of Sambalpur, 
will, doubtless, be undertaken ere long by the Geological Survey. 
If the stratum which contains the diamonds should be identified, 
and if its lateral extension should prove equal to the known area 
occupied by the Vindhyan rocks, then we shall havea diamond- 
bearing tract probably greater in area than either those of 
Karnul or Bandelkhand. 
CHUTIA NAGPUR. 
As already stated above, on page 18, the upper portion of 
Ptolomey’s Adamas jlus passes through a district named Coc- 
conage, which would include Chutia Nagpur. Independently of 
this, however, there are good reasons for believing that diamonds 
were found in Chutia Nagpur. The following notices on the 
subject I quote from a paper by the late Mr. Blochmann* :-— 
“ Kokrah (the ancient name of Chutia Nagpur) was known at the 
Mogul court for its diamonds, and it is evidently this circumstance which 
led the generals of Akbar and Jahangiri to invade the district. I have 
found two notices of Kokrah in the Akbarnamah, and one in the 
Tuzuk-i-Jahangiri, from which it appears that Chutia Nagpur was ruled 
over in 1585 by Madhu-Singh, who in that year became tributary to 
Akbar. He was still alive in a.p. 1591, when he served under Man 
Singh in the Imperial Army which invaded Orissa. ‘‘Tuzuk--Jahangiri 
(p. 155):—On the 3rd Isfandiarmuz of the 10th year of my reign (A.D. 
1616) it was reported to me (Jahangiri) that Ibrahim Khan (Governor 
of Bihar) had overrun Kokrah and taken possession of its diamond- 
washings. This district belongs to Swbah Bihar, and the river which 
flows through it yields the diamonds. When the river contains little 
water, tumuli and hollows are formed. The diamond-diggers know from 
* Journal Asiatic Society of Bengal, Vol. xi. 
