This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1804 Excerpt: ... it was in that state, it may be expected that some instances should be adduced of its having been found in an intermediate state between that of fluidity and that in which it is supposed constantly to exist. But it must be considered that the characteristic physical properties of amber, such as yielding a ...
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1804 Excerpt: ... it was in that state, it may be expected that some instances should be adduced of its having been found in an intermediate state between that of fluidity and that in which it is supposed constantly to exist. But it must be considered that the characteristic physical properties of amber, such as yielding a peculiar odour, and becoming attractive by friction, depend on its indurated state, and must therefore be sought for in vain, in an inferior state of inspissation. To ascertain, with precision, therefore, from what species of liquid bitumen it is derived, may be impossible; since we are reduced, whilst seeking for the analogous fluid bitumen, to trace it by the aid only of such physical properties as colour, degree of transparency, &c. which are common to both states. By these marks, perhaps, if the substances had been examined with a view to that inquiry, some analogy might have been discovered between amber and those bituminous masses found by Stelluto, and those said to resemble mastich and frankincense, which are described by Dr. Woodward and Mons. Fontaine, and which were found even incorporated with fossil wood, with which substance, we have already seen, amber is found generally associated. "Were such specimens again to be found, it would be, certainly, highly desirable to ascertain whether, by continued exposure to a slightly increased degree of temperature, or by Jong keeping, it would acquire the hardness and other properties of amber. A specimen of bitumen from Castleton, in Derbyshire, which. I possess through the kindness of Mr. Mawe, shews that bitumen in. a soft state, may possess the colour as well as the transparency of amber. It exists in a piece of lime-stone, to which it adheres very closely. Its transparency is almost that of...
Product dimensions: 7.44 (w) x 9.69 (h) x 0.31 (d)
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