Reviews—J. B. Scrivenor—Geology of Malay States. 125 
of the greenstone by quartz, but whether the veins in the vicinity were 
also formed by a similar replacement or not, I have no definite proof, 
but I believe that replacement took a large share in their formation. 
A number of the members here may think that such questions have 
no bearing on mining problems, and I have often heard men say that 
they did not care how the gold got into the rocks, that all they were 
interested in was where it was. Now the world has advanced too far 
to ignore the causes of things; if those things are to be clearly 
understood and if you are to clearly understand the bodies of ore 
which you are working you cannot afford to ignore the question of 
the causes which lead to the formation of those ore bodies, since 
a knowledge of those causes may enable you to correctly predict the 
extensions “of those ore bodies or may point y you to where other similar 
ore bodies occur. 
RAV LH ws. 
1.—Geotocy oF THE FeperareD Matay Srates. Geologists’ Annual 
Report for the year 1914. By J. B. ScrivEenor, Geologist F.M.S. 
ARLIER reports, e.g. that for the period September, 1908, to 
January, 1907 (reviewed in the Groroeican Magazine, 1907, 
pp. 565-7), have given British geologists an opportunity of becoming 
acquainted with the general geology of the Federated Malay States, 
while Mr. Scrivenor’s finely illustrated report, Zhe Geology and Mining 
Industry of the Kinta District, Perak (1918), has described the 
district which is most interesting and important both geologically 
and economically. The present report, which deals principally with 
economic questions, is a record of steady progress, though it does not 
include any startling discoveries. There is only a brief reference to 
the field work of Mr. Scrivenor in mapping the Batang Padang 
district. Such work is bound to be carried out under many difficulties 
in view of the climate and of the dense vegetation which covers so 
Hee of this country. 
Scrivenor took the opportunity a accompanying the district 
os of Upper Perak in a journey to the little-known region near 
the headwaters of the Perak River. He briefly describes the country 
as an area of granite at no great elevation, supporting masses of altered 
bedded rock with quartz porphyry and basic volcanic rocks. 
The report shows that the chemist, Mr. C. Salter, has been 
occupied with economic work, chiefly assays for minerals, but 
including also a number of analyses. It is satisfactory to learn that 
Mr. Scrivenor is getting together a collection of photographs illustrating 
the geology of the country. 
The author describes a successful attempt to replace the diamond by 
local corundum for drilling purposes. A consignment of kaolin was 
shipped to Kurope in order to ascertain if it could be used for pottery. 
Unfortunately, owing to the War, half the consignment failed to 
reach its destination. 
Not much further information is given concerning the greatest 
industry of the peninsula, that of tin-mining, and no further light is 
