The quick, great and unprecedented sale of the first and second editions demonstrates, more than the strongest language could possibly do, the extraordinary and increasing popularity of this work.

The Third Edition contains two hundred and sixteen 12mo.
pages, of a larger size and in smaller type than either of the preceding editions, and is illustrated with numerous wood-cuts.

It is intended to be the best practical work extant; substantially bound in cloth, price One Dollar; forwarded by mail (postage prepaid).

Address S.D.HUMPHREY, New York A GUIDE TO PHOTOGRAPHY, Containing simple and concise directions for obtaining Views, Portraits, etc., by the chemical agency of Light, by W.H.
Thornthwaite, author of "Photogenic Manipulations," etc.

Illustrated with numerous wood-cuts.