Just Published, Cloth, Demy 8vo. Price 3)- net. 
EXTERIOR & INTERIOR PHOTOGRAPHY, 
FREDERICK W. "MILLS, ERAS 
Author of ‘PHOTOGRAPHY APPLIED TO THE Sages. etc. 
Contents :—Apparatus—Light and Colour—Exposure of Exteriors—Exposur 
of Interiors — Development — Intensification of Negatives—-The Plat simope 
Processes— Bromide fess Ran EL os ri vege, Ratt et on Gelatino- Chloride 
Pa ndex. 
ILLUSTRATED. 
oe London: DAWBARN & Warp, Lrp., 6, Farringdon Avenue, E.C. 
NATURAL SCIENCE. 
THE JULY NUMBER, NOW READY, 
Contains Contributions from THIRTY-FIVE of the most eminent NATURALISTS 
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It isa handy summary of the = Results of the ‘‘ Challenger ” ee 
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INDISPENSABLE TO TEACHERS AND STUDENTS. 
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The Price of the July Number is as usual, One Shilling Net. 
ln Demy 8v0., Cloth, pp. 250. Price 121- (U.S.A. 3-50). 
AN INTRODUCTION TO THE STUDY OF THE 
DIATOMACE 2, 
By FREDERICK WM. MILLS, F.R.M.S, 
Author of ‘ Photography Applied to the Microscope,’ etc. 
WITH A BIBIIO;CGCHRAPHY. 
By JULIEN DEBY, F.R.M.S. — 2 
ep eee Sikes & So®, 3, St. Bride Street, Ladente <i 
WasHINGTON, D.C.: THE: MICROSCOPICAL PUBLISHING Goharaiee. 
VERTEBRATE FAUNA of YORKSHIRE 
Being a Catalogue of British Mammals, Birds, Reptiles, Amphibians an d Fishes, showing 
_. what species are or have, within historical petiods, been been found in the county. 
WM. EAGLE CLARKE, F.L. = & WM. — ge FL. . 
CE 8s. HAD OF THE AUTHORS, O 
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TONDON 
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