The Naturalist in NicaraguaJ. M. Dent & Sons, 1911 - 306 pages |
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Page 76
... mines temporarily closed by them in the wet season . 3 Mr. David Forbes , 1 in his account of the geology of Peru and Bolivia , has advanced the opinion that auriferous quartz veins belong to two different systems , one occurring in con ...
... mines temporarily closed by them in the wet season . 3 Mr. David Forbes , 1 in his account of the geology of Peru and Bolivia , has advanced the opinion that auriferous quartz veins belong to two different systems , one occurring in con ...
Page 77
Thomas Belt. Origin of Mineral Veins 77 plete gradation from veins of perfectly crystallised granite , through others abounding in quartz at the expense of the other constituents , up to veins filled with pure quartz , as at Porth Just ...
Thomas Belt. Origin of Mineral Veins 77 plete gradation from veins of perfectly crystallised granite , through others abounding in quartz at the expense of the other constituents , up to veins filled with pure quartz , as at Porth Just ...
Page 78
... quartz veins , a regular filling up from the sides towards the centre , as in veins produced by deposits from springs . Quartz veins extend sometimes for miles , and it is necessary to suppose on the hydro - thermal theory that the ...
... quartz veins , a regular filling up from the sides towards the centre , as in veins produced by deposits from springs . Quartz veins extend sometimes for miles , and it is necessary to suppose on the hydro - thermal theory that the ...
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amongst ancient animals ants Atlantic attacks beautiful beetles birds branches bushes butterflies carried cattle Central America Chontales colour continued couvade covered crossed dark Depilto Ecitons feet flowers forest fresh-water fruit glacial period gold grass green Greytown ground hills humming-birds Indians inhabitants insects islands Jinotega journey Juigalpa lake land larvæ leaf leaf-cutting ants leaves Libertad live lodes longicorn look maize Masaya Matagalpa Mexico miles mines mountain mules Nahuatls natives nearly nest Nicaragua night numerous o'clock Ocotal passed plains plants prey probably quartz quartz veins rain range reached resemblance Rio Frio river road rocks rocky San Ubaldo Santo Domingo savannahs seen side slope soon Spaniards species spiders steep stones surface Teustepe told Totagalpa town trachyte travelling trees tropical America valley variety vegetation Velasquez wasps whilst wings yellow young