Chapter I

) There are 369 illustrations and an index.

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“The photographic reproductions and clear and carefully executed drawings are calculated to give sufficient detail without introducing unnecessary complexity.”

+ =Engineer= 129:225 F 27 ’20 380w

+ =N Y P L New Tech Bks= p32 Ap ’20 160w

=POOLE, ERNEST.= Blind. *$2.50 (2c) Macmillan

20–18299

The theme of this novel is stated in