An Introduction to Conchology Or Elements of the Natural History of Molluscous
An Introduction to Conchology Or Elements of the Natural History of Molluscous
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In our eReader you can find the full English version of the book. Read An Introduction to Conchology Or Elements of the Natural History of Molluscous Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book An Introduction to Conchology Or Elements of the Natural History of Molluscous
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A good illustration of this structure may be obtained by examining with a pocket-glass the fractured edge of a Cone, Olive, or other spiral shell, in which the extremities of the laminae of the outer and inner plates, and the sides of those of the central layer, or the converse, will be observed, accord- ing to the direction of the fracture, the extremities of the laminae showing the angles of the crystals, while their sides, when closely examined, will often exhibit the crystalline flakes. In ...order to observe the lines of cleavage, the best mode of proceeding is to bruise part of a shell with a ham- mer, and to examine the fragments moistened under a micro- scope, until one is discovered which exhibits two laminae in conjunction. The plates and their structure are also well seen in the polished surfaces of shells which have been slit or ground down to exhibit the internal structure of their cavity. The relative thickness of the three plates varies in different species ; but as far as I have yet examined, the central plate is generally rather the thickest, and the outer one the thinnest.
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To quickly assess the difficulty of the text, read a short excerpt:
A good illustration of this structure may be obtained by examining with a pocket-glass the fractured edge of a Cone, Olive, or other spiral shell, in which the extremities of the laminae of the outer and inner plates, and the sides of those of the central layer, or the converse, will be observed, accord- ing to the direction of the fracture, the extremities of the laminae showing the angles of the crystals, while their sides, when closely examined, will often exhibit the crystalline flakes. In ...order to observe the lines of cleavage, the best mode of proceeding is to bruise part of a shell with a ham- mer, and to examine the fragments moistened under a micro- scope, until one is discovered which exhibits two laminae in conjunction. The plates and their structure are also well seen in the polished surfaces of shells which have been slit or ground down to exhibit the internal structure of their cavity. The relative thickness of the three plates varies in different species ; but as far as I have yet examined, the central plate is generally rather the thickest, and the outer one the thinnest.
What to read after An Introduction to Conchology Or Elements of the Natural History of Molluscous?
You can find similar books in the "Read Also" column, or choose other free books by George Johnston to read onlineMoreLess
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