of Salem and Barramahal. 173 



these veins branch off, continuing in the deflected direction 

 as straight a course as the non-deflected portion ; and I have 

 also occasionally observed that the deflected and separated 

 vein becomes diffused into the mass of the granite, by a gra- 

 dual spreading and mingling of the substance of the two. 



Irregular- shaped portions of a rock perfectly similar to 

 the veins, occur frequently embedded in the mass of the 

 granite of large hills ; sometimes as tortuous, broad veins, 

 which gradually fine out, or which sometimes gradually 

 mingle in the mass ; and both these irregular veins and 

 masses, and also the dyke-like veins, always contain em- 

 bedded in their substance grains, or fine veins, or sometimes 

 large pieces of magnetic iron ore. 



I think from what has been stated, there is pretty good 

 ground for considering all these as veins of segregation, or 

 at least as veins cotemporary with the mass. 



Lenticular-shaped veins of quartz, two feet in length, and 

 an inch or two in width, are also common, and the dis- 

 ruption of veins which cross these diagonally, may be some- 

 times also seen. 



In some places I have observed narrow tortuous quartz 

 veins, which run many yards through the mass ; but disrupt- 

 ed in the manner represented in the sketch,* the ends finish- 

 ing in fine stripes, and sometimes are even connected 

 by a fine thread, as if they were portions of a single vein, 

 separated and altered and compressed by some peculiar 

 movement in the parts of the mass. 



On looking over Dr. Boase's accurate description of the 

 lodes which contain the minerals of Cornwall, (Primary 

 Geology, chapter ix.) it will be seen, that these veins and 

 embedded irregular masses answer nearly exactly to the 

 description of the lodes, except in being on a much smaller 

 scale. 



* Sketch not received.— Ed. 



