GEOLOGICAL SOCIETY. 



159 



character and appearance to those of Smith's mine as to 

 leave little or no doubt of the identity of the loads. 



It was also omitted to be stated in the former report, 

 that about 3,000 bushels of gold ore was at that time 

 raised and lying upon the ground, viz. 1,352 bushels of 

 picked ore in the ore-house No. 13 of the map or plan, 

 and about 756 bushels of like ore in the house No. 14, 

 besides about 1,000 bushels of ordinary, but workable 

 ores, in various heaps about the ground. 

 I have the honor to be, gentlemen, 



Your very obedient servant, 



JOHN MILLINGTON. 



Philadelphia, Aug, 5, 1834. 



SUPPLEMENT TO THE ABOVE REPORT. By Professor Del Rio. 

 To the President and Members of the Geological Society of Pa* 



If by geology we are enabled to infer the resemblance, 

 or even the identity of the sites of the different metals, 

 it is by the minute observation of every locality that we 

 obtain our data. 



Mr. J. Dickson has recently published in the Trans- 

 actions of the Geological Society of Pennsylvania, an 

 essay on the gold region of Virginia, in which he states 

 that " the Rappahannock mines perfectly resemble all 

 the others in Virginia," and further, "that the largest 

 amount of gold has been obtained from a class of mines 

 generally known by the name of branch mines, or stream 

 mines, situated in the beds of rivers and rivulets, or ra- 



