GEOLOGY OF THE MERRIMACK DISTRICT. 



517 



Marlow. There is one in Marlborough, at L, Blodgett's, where there are 

 small but brilliant crystals, and another near the summit of Monadnock. 

 These are among the most important we have seen. 



There is one thing of special interest that we have noticed in regard to 

 the position of the larger crystals of beryl. We find that all those above 

 five inches in diameter have their vertical axes perpendicular, or very 

 nearly so, to the plane of the horizon. If the strata were in their present 

 position at the time of the formation of the vein, and the material of 

 which it is comprised was derived from the adjacent rocks, this would 

 seem to be the natural position of the crystals. 



3Stie 



■Sheet 



J H. RAE. 



Improvement in Voltafc Amalgamators for Gold and Silver 



No. 123.932. Patented feb. 20, 1872. 



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