Produced by Simon Gardner, Chris Curnow and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images generously made available by The Internet Archive) Inconsistent spellings (e.g. depolariser & depolarizer) and hyphenation (e.g. guttapercha & gutta-percha) are retained as in the original text. Minor punctuation errors are corrected without comment. Changes which have been made to the text (in the case of typographical errors) are listed at the end of the book.…
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