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Chemical substances (also called pure substances) may well be defined as "any material with a definite chemical composition" in an introductory general chemistry textbook.[2] According to this definition a chemical substance can either be a pure chemical element or a pure chemical compound. But, there are exceptions to this definition; a pure substance can also be defined as a form of matter that has both definite composition and distinct properties.[3] The chemical substance index published by CAS also includes several alloys of uncertain composition.[4] Non-stoichiometric compounds are a special case (in inorganic chemistry) that violates the law of constant composition,. | The Project Gutenberg EBook of The Way To Geometry by Peter Ramus This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.net Title The Way To Geometry Author Peter Ramus Translator William Bedwell Release Date October 2 2008 EBook 26752 Language English START OF THIS PROJECT GUTENBERG EBOOK THE WAY TO GEOMETRY Produced by Jonathan Ingram Keith Edkins and the Online Distributed Proofreading Team at http www.pgdp.net Transcriber s note. Several few typographical errors have been corrected. They appear in the text like this and the explanation will appear when the .