Tavistock, Sept. 18, 1907.

[Added March 1, 1908.] A slight delay in the publication of this book has afforded the opportunity of obtaining the new and quite unexpected information given in the supplementary chapter.

FOOTNOTES:

[A] "Impact with a Liquid Surface," by Worthington and Cole. Phil. Trans. Roy. Soc., A 193, 1897, and A 255, 1900.

[B] Pearson's Magazine, July and August, 1898.


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