Chap. I. ] 
SCOPE OP MEMOIR. 
Of the manganese areas not examined by me, Mr. J. M. Maclaren 
visited the Belgaum and Dharwar districts (in 1905) ; and he has kindly 
supplied me vnth notes and specimens from the deposits of these parts. 
During the field season of 1906-07 Messrs. H. Walker and A. M. 
Heron, whilst working in the Jhabua State, were able to examine some 
unimportant deposits not visited by me ; I have made use of their notes 
in amplifying the account of the deposits of Jhabua. 
It will thus be seen that some considerable time has elapsed since the 
main body of the field work was carried out. Before the investigation 
was begun, the little knowledge we had about this mineral did not lead 
us to expect results of more than ordinary interest. The field-work, 
however, showed that the manganese-ore deposits are in some parts, 
notably the Central Provinces, Vizagapatam, Jhabua, and Narukot, 
associated with most interesting and fascinating series of rocks ; and that 
the deposits themselves contain many rare minerals and not a few spe- 
cies and varieties new to science. It was felt that even bare justice could 
not be done to the subject without a somewhat detailed investigation of 
these rocks and minerals. 
Further, diiring the laboratory examination of these specimens, 
fresh specimens, and information relative to the discovery of new 
deposits of manganese-ore, have been pouring in from miners and pros- 
pectors in all parts of India. Hence the delay in the appearance of this 
accomit of the Indian manganese-ore deposits. The gap has been to a 
certain extent filled by the publication of the paper entitled ' Manganese 
in India ', referred to on page 11. It was read on March 26th, 1906, 
and published in the autumn of the same year. 
I have endeavoured to treat the subject of this Memoir with some 
, , . fullness, from each of the following points of 
fecope of this Memoir. . tt- i • . i • i i 
View :— Mmeralogical (Fart I), geological and 
genetic (Part II), economic (Part HI), and descriptive (Part IV). I have 
not, however, been able to keep in touch with all the fresh discoveries, 
and can usually give only meagre accounts of deposits not visited by 
myself or one of my colleagues. Even whilst this work is passing through 
the press fresh discoveries are being made, accounts of which it will be 
impossible to include. But although I have not been able to examine 
every known deposit, I do not think I have missed any important type. 
In the descriptive part of this Memoir I have given fairly detailed 
accounts of a large number of deposits. It might be thought that a 
