will be found, upon comparison, to be superior in every respect to all other brands on the market. Its distinctive points of superiority are:

1ST.—ABSOLUTE PURITY

2D.—PERFECT CRYSTALLIZATION

3D.—IMMACULATE WHITENESS

4TH.—EXTREME LIGHTNESS

5TH.—MODERATE COST

(Its price is not higher than that of any other make.)

WHEN ORDERING SPECIFY "MERCK'S."

TO BE HAD OF ALL DEALERS.

TESTIMONIALS.

"I have tested Merck's pyro carefully in comparison with the other pyros at present on the market, and I find that it is superior to any and all of them."

Prof. Charles Ehrmann,
Instructor of the Chautauqua School of Photography.

"I shall, in future, certainly use no other pyro but Merck's. The best is always good enough for me."

Alfred Stieglitz,
Editor American Amateur Photographer.

"Merck's Pyrogallic Acid will be found a very superior article. Its purity is absolute, with quick crystallization and immaculate whiteness. In use, it produces the highest intensity that can be desired in the negatives. The detail in light and shade is perfect, producing printing qualities unsurpassed by any pyro we have ever used."

St. Louis and Canadian Photographer.

"Merck's pyro has undergone a severe test in my hands. I find it to possess many qualities which give it superiority over all other makes. Authorities place the solubility of pyro as one part in two of water. I found one ounce of Merck's to dissolve readily in 1:7 of water at 60°. It is extremely light, pure, and of a fine white color, giving rich negatives full of vigor and sparkling brilliancy."

Walter E. Woodbury,
Editor of The Photographic Times.

"I have used Merck's Pyrogallic Acid, and prefer it to all others."

B. W. Kilburn,
Official Photographer (Stereoscopic), at the Columbian World's Fair, and San Francisco Mid-Winter Exposition.

"I have tried Merck's pyro and must certainly say it is the best I ever used. The results I have obtained with it are remarkably fine."

W. B. Post,
Amateur Photographer, New York.

Moreno Studio, Fifth Ave., New York.

"I have been using Merck's pyro in my studio, and am very well pleased with it. It is clean, gives brilliant negatives, and is reliable, one day's work being exactly the same as another's."

A. Moreno.

"I have been using Merck's pyro, and am ready to indorse the high praise which you have found it entitled to: 'that it is superior in point of purity, lightness and solubility' to any like product that I have seen. In fact, 'the new and improved process' seems to reach in its result the point beyond which it is impossible to go—that is, perfection. This was my impression at first sight, and using serves only to confirm it.

In my opinion, pyro stands at the head of all developers of dry plates, and I am much mistaken if Merck's pyro, when known, does not lead all brands of pyro."

W. H. Sherman,
Professional Photographer, Milwaukee.