240 STREAM TIN DEPOSITS OF PERAK. 



plausible guesses. In tracing back things like the metalliferous 

 deposits to their true causes, we are still working very much in the 

 dark. My object in this lecture has been to point out what is 

 really known about metamorphism and to show how it bears upon 

 the occurrence of such ores as Cassiterite. I hope I have at least 

 succeeded so far as to give you a clear and simple exposition of 

 the subject, and with this, I must rest satisfied and conclude my 

 lecture.* 



■:o:- 



*Note. — Tin is found in drifts or alluvial deposits in Perak. Many 

 think that it must have been derived from veins and that these will yet be 

 found. The context of these lectures will show that I do not think so. The 

 true matrix of the tin is in granite at its junction with the clays where it ha* 

 been abundantly disseminated in fine and coarse grains. Nevertheless, in north- 

 ern Perak there are tin veins or true lodes. Furthermore, I wish to place on 

 record my opinion that the stream tin deposits of Perak are practically inex- 

 haustible. 



