224 ANNUAL OF SCIENTIFIC DISCOVERY. 







The value of gold assessed for Internal Revenue the past year 

 has been 81,389,541 dollars. Of this amount, 70.032,805 were as- 

 sessed on the Pacific side ; 25 per cent, of the whole product being 

 estimated as having escaped assessment. Adding this, and allow- 

 ing about half the gold assessed in the East to be foreign, the total 

 domestic production is estimated at 93,219,374 ; an increase of 

 19,675,015, in comparison with 1865. 



The different states and territories have yielded in the following 

 order : California about one-third ; Nevada, one-fourth ; Montana, 

 one-sixth ; Idaho, one-twelfth ; Colorado and Oregon, one-sixth 

 of the total amount. 



TIN IN THE UNITED STATES. 



There has been recently discovered in Missouri an extensive 

 system of tin-bearing veins, under conditions which character- 

 ize similar deposits in Cornwall, Zinnwald, and Attenberg. The 

 annual imports of tin, and its manufactures, into the United 

 States, now exceed 5,000,000 of dollars, four-fifths of which is 

 imported from Great Britain. If this demand could be supplied 

 from the product of our own country, it would contribute essen- 

 tially to the national industry and wealth. The ore is found in 

 the form of oxide and sulphuret, associated with tungsten and its 

 ores, copper, iron, soapstone, kaolin, asbestos, and serpentine. 





