 | Sir Henry George Ward - 1828 - 748 páginas
...adopt the theory, that the proportion of silver contained in the ores increases as you advance towards the North ; a theory which is very generally believed,...ores to those of the richest districts in the South. The idea probably originated in the discovery of the famous Bolas de Plata, (Balls of Silver,) of Ari^ona,... | |
 | Sylvester Mowry - 1864 - 270 páginas
...theory very generally believed at present in Mexico, and certainly confirmed by the superiority of the northern ores to those of the richest districts in the south. The idea probably originated in the discovery of the famous bolas de plata (balls of silver) of Arizona,... | |
 | James Parker Whitney, Joel Parker Whitney - 1865 - 112 páginas
...that the proportion of silver contained in the ores increases as you advance North, a theory which is generally believed at present, in Mexico, and which...ores, to those of the richest districts in the South." The line of Mexico at that time extended along the Arkansas Kiver to the 4'2d parallel, which included... | |
 | Richard Josiah Hinton - 1878 - 602 páginas
...it is often found only at a depth of more than a thousand feet from the surface. What I have seen of ores extracted from them almost induces one to adopt...ores to those of the richest districts in the south. " The idea probably originated in the discovery of the famous Bolas de la Plata (balls of silver) of... | |
 | Joel Parker Whitney - 1906 - 494 páginas
...that the proportion of silver contained in the ores increases as you advance north, a theory which is generally believed at present in Mexico, and which...confirmed by the superiority of all the northern ores over the richest districts in the South. "The line of Mexico at that time extended along the Arkansas... | |
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... the North ; a theory which is very generally believed, at present, in Mexico, and which is certainly confirmed by the superiority of all the Northern ores to those of the richest districts in the South. 