Chapter 25

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HEAT. By MARK R. WRIGHT, Hon. Inter. B.Sc. (Lond.). With 136 Illustrations and numerous Examples and Examination Papers. Crown 8vo., 4_s._ 6_d._

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MAGNETISM AND ELECTRICITY. By ARTHUR WILLIAM POYSER, M.A. With 317 Illustrations. Crown 8vo., 4_s._ 6_d._

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PHYSIOGRAPHY. By JOHN THORNTON, M.A. With 6 Maps, 203 Illustrations, and Coloured Plate of Spectra. Crown 8vo., 4_s._ 6_d._

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A MANUAL OF MECHANICS. With 138 Illustrations and Diagrams, and 188 Examples taken from Examination Papers, with Answers. By T. M. GOODEVE, M.A. Crown 8vo., 2_s._ 6_d._

SOUND, LIGHT, AND HEAT. By MARK R. WRIGHT, M.A. With 160 Diagrams and Illustrations. Crown 8vo., 2_s._ 6_d._

METALLURGY: an Elementary Text-Book. By E. L. RHEAD. With 94 Illustrations. Crown 8vo., 3_s._ 6_d._

PHYSICS. Alternative Course. By MARK R. WRIGHT, M.A. With 242 Illustrations. Crown 8vo., 2_s._ 6_d._

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TRANSCRIBER'S NOTES

1. Passages in italics are surrounded by _underscores_.

2. The word Pharmacopoeia uses an oe ligature in the original.

3. Minor changes were made for the purpose of consistency in the book list at the end, like adding period, etc.

4. The following misprints have been corrected: "sufficiemt" corrected to "sufficient" (page 45) Changed "--" to "-" in nitrogen-fixing (page 151) Joined words "intel lectual" split over two lines (page 236) Missing text "to" added after "incidental" (page 285)

5. Other than the corrections listed above, printer's inconsistencies in spelling, punctuation and hyphenation have been retained.

End of Project Gutenberg's Twentieth Century Inventions, by George Sutherland