. 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. 201 POLITICAL ESSAY ON THE [book iv. III this manner, during the space of two, three, and even five months, the paste is balanced between the magistral and the lime; for the effects are very different according to the tem- perature of tlie atvnosphere, the nature of the minerals, and the motion given to the schlich. Do they imagine that the action is too strong, and that the muss is working too much? They allow it to repose : and in doing so do they * wish to, accelerate the amalgamation, and in- crease the heat ? They repeat oftener the repassos, sometimes employing men, and some- times mules. If the amalgamation is formed too quickly, and appears in the form of small globules, called pasillas or copos, they feed the paste {si ceha la torta), by again adding mercury with a little magistral, and sometimes with salt. When from the exterior characters, the azoguerc judges that the mercury has united with the whole silver contained in the minerals, and that the paste has yielded {ha rendido), the metallick muds are thrown into vats of wood or stone. Small mills provided with sails placed perpendicularly, turn round in these vats. These machines {tinas de cat y canto) which are parti- cularly well executed at Guanaxuato, have a resemblance to those established at Freiberg, to wash the remains of the amalgamation*. ? Fragoso de Segueir
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Keywords: ., bookcentury1800, booksubjectagriculture, booksubjectminesandmine
