Paviland Cave An Aurignacian Station in Wales the Huxley Memorial Lecture Fo
Paviland Cave An Aurignacian Station in Wales the Huxley Memorial Lecture Fo
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Exerts a corrosive action on silicates. It was therefore necessary to make a control experiment, and some fragments of flint were heated in water up to this temperature for 48 hours in a sealed tube. The glass tube was corroded by this treatment, but not the flints. The experiment, however, is not decisive, since some flints yield so much more readily to solution than others.
I have also exposed freshly fractured flint to the action of a concentrated solution of ammonia for the space of six mon...ths under atmospheric conditions of temperature and pressure, but without result : a similar experiment, made with a decomposing organic solution which evolved ammonia freely, was equally fruitless.
If we wish to probe the question of patination deeper we must endeavour to obtain some clear ideas on the constitution of flint. As early as 1833 Fuchs proposed to regard flint — and chalcedony, which only differs from it by possessing a fibrous, instead of a granular structure — as a mixture of crystalline silica or quartz and colloidal, or, as he termed it, " amorphous " silica, i.
What to read after Paviland Cave An Aurignacian Station in Wales the Huxley Memorial Lecture Fo?
You can find similar books in the "Read Also" column, or choose other free books by W J William Johnson Sollas to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Exerts a corrosive action on silicates. It was therefore necessary to make a control experiment, and some fragments of flint were heated in water up to this temperature for 48 hours in a sealed tube. The glass tube was corroded by this treatment, but not the flints. The experiment, however, is not decisive, since some flints yield so much more readily to solution than others.
I have also exposed freshly fractured flint to the action of a concentrated solution of ammonia for the space of six mon...ths under atmospheric conditions of temperature and pressure, but without result : a similar experiment, made with a decomposing organic solution which evolved ammonia freely, was equally fruitless.
If we wish to probe the question of patination deeper we must endeavour to obtain some clear ideas on the constitution of flint. As early as 1833 Fuchs proposed to regard flint — and chalcedony, which only differs from it by possessing a fibrous, instead of a granular structure — as a mixture of crystalline silica or quartz and colloidal, or, as he termed it, " amorphous " silica, i.
What to read after Paviland Cave An Aurignacian Station in Wales the Huxley Memorial Lecture Fo?
You can find similar books in the "Read Also" column, or choose other free books by W J William Johnson Sollas to read onlineMoreLess
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