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Devon and Cornwall Notes & Queries. (Volume 4, (Paperback) Loot Price: R271
Discovery Miles 2 710
Devon and Cornwall Notes & Queries. (Volume 4, (Paperback): John S. Amery
Devon and Cornwall Notes & Queries. (Volume 4, (Paperback): John S. Amery

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Devon and Cornwall Notes & Queries. (Volume 4, (Paperback)

John S. Amery; Created by General Books

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Loot Price R271 Discovery Miles 2 710

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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.1906 Excerpt: ... CHAPTER VII. The Dartmoor Granite and Exeter Lavas. There are two ways in which a given proposition can be proved. The first is by what is called direct evidence, which means the announcement of a fact or facts which cannot be explained on any other hypothesis than the one. The second is by so-called circumstantial evidence, which usually consists of a number of facts, any one of which can be explained also by some other hypothesis, but all of which find their common explanation in the proposition in question. The larger the number of these circumstantial points the more convincing is the proof, until it becomes every bit as conclusive as the most direct evidence we can imagine. At the end of the last chapter some questions were asked which we shall now attempt to answer, not by any proof of the first order, but by an amount of circumstantial evidence which seems to the writer to be fully conclusive. It is the fashion in mathematics to preface the proof of any proposition by a concise statement of the theorem which will be shown to be correct. We shall follow this method here, and as we go on shall consider the main objections and rival explanations. We shall attempt, then, to show that the granite mass of Dartmoor is really the solidified upper part of the cooled lava reservoir from which the Carboniferous and Post-Carboniferous volcanoes of Devon were fed. That it was at one time crowned not only by a great mass of Culm strata, but also by extensive volcanic cones from which acid lavas were outpoured, and from which explosive eruptions built up layers of volcanic ash. Simultaneous with these acid extrusions others of a very different character were taking place, outflows of basic and intermediate lavas of peculiar character issuing from other vents, which...


Imprint: General Books LLC
Country of origin: United States
Release date: February 2012
First published: February 2012
Authors: John S. Amery
Creators: General Books
Dimensions: 246 x 189 x 4mm (L x W x T)
Format: Paperback - Trade
Pages: 72
ISBN-13: 978-1-151-25524-2
Barcode: 9781151255242
Categories: Books
LSN: 1-151-25524-6

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