. Political essay on the kingdom of New Spain [microform] : containing researches relative to the geography of Mexico, the extent of its surface and its political division into intendancies, the physical aspect of the country, the population, the state of agriculture and manufacturing and commercial industry, the canals projected between the South Sea and Atlantic Ocean, the crown revenues, the quantity of the precious metals which have flowed from Mexico into Europe and Asia, since the discovery of the new continent and the military defence of New Spain. Agriculture; Mines and mineral resourc
. Political essay on the kingdom of New Spain [microform] : containing researches relative to the geography of Mexico, the extent of its surface and its political division into intendancies, the physical aspect of the country, the population, the state of agriculture and manufacturing and commercial industry, the canals projected between the South Sea and Atlantic Ocean, the crown revenues, the quantity of the precious metals which have flowed from Mexico into Europe and Asia, since the discovery of the new continent and the military defence of New Spain. Agriculture; Mines and mineral resources; Agriculture; Mines et ressources minières. \ CHAP. XI.] KINGDOM OF NEW SPAIN. ^^^ in every climate, the di!»tnbntion of silver has been very unequal; sometimes concen- trated in one point, and at other times dis- seminated in the gancjiie, and allied with other metals. Sometimes in the midst of the poorest minerals we find very considerable masses of native silver; a phenomenon which appears to depend on a particular operation of chemical aflinities, with the mode of action, and laws of which we are completely ignorant. The silver in place of being concealed in ga- lenae, or in pyrites in a small degree argen- tiferous, or of being distributed throughout all the mass of the vein over a great extent, is collected into a single mass. In that case the riches of a point may be considered as the principal cause of the poverty of ii c neighbouring minerals; and hence we may conceive why the richest parts of a vein are found separated from one another by portions of gaiigue almost altogether destitute of me« tals. In Mexico, as well as in Hungary, large masses v/*' native silver and f/laserz, appear only in a reniform shape (par rogn&ns -,) the com* posed rocks exhibit the same phenomena as the masses of veins. When we examine with care the structure of granites, syenites, and porphyries, we discover the effects of a pa?- ticular attraction in the chrystals of ?/iica, aniph
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Keywords: ., bookcentury1800, booksubjectagriculture, booksubjectminesandmine
