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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.org].

This eBook is produced by the Online Distributed Proofreading Team at [www.pgdp.net].

This ebook is an extract from the The Philippine Journal of Science, Section D, Volume VIII, 1913, pp. 58–117. Scans of this work are available from the Internet Archive (copy [1]).

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