BY THE REV. J. E. TENISON-WOODS, P.G.S., F.L.S., &C. 1203 



2. These are drift formations derived from the weathering and 

 wearing down by water of the granite and other overlying strata 

 on the neighbouring hills. 



3. They have accumulated very slowly in the beds of ancient or 

 existing streams. 



4. It is probable that the tin has been mostly derived from the 

 wearing down of the paleozoic clays and granite at their point of 

 junction. 



5. Tin must therefore be sought for only at the base of hills in 

 ancient drift beds. Generally also the western slopes are the 

 richest. 



6. Red and yellow clays, or better still an outcrop of slates at 

 the foot of a range are favouraljle indications. 



7. True tin lodes or mineral veins have only been found in the 

 northern pax't of the State, and these have not been worked. 



I may state further that the general impression left on my mind 

 is that only a small portion of the tin deposits of Perak has yet 

 been worked. The similarity of the formations throughout the 

 State gives good ground for believing that tin may be expected on 

 the western bases of all the mountain groups I have referred to. 

 I cannot speak so certainly as to the main range, which geolo- 

 gically may be more modern and belong to an entirely different 

 mountain system. 



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