Purch f Mineral 
Will find our stock the largest, most varied, and in every way the best in the 
United States. Our 100-page illustrated catalogue indexes every variety, and 
gives valuable scientific papers, etc. Price, 15c., or handsomely bound, 25c. 
25,000 miles of travel by members of our firm are planned for the summer 
of ’91, exclusively for the purpose of securing minerals. 
WRITE TO US FOR WHATEVER YOU WANT. 
Geo. L. English & Co. 733 AND 735 Broanway, 
MINERALOGISTS. New YORK. 
: Covers FOR THE NATURALIST. 
Handsomely stamped cloth covers for use in binding THE © s 
NATURALIST have been prepared by the publishers, and will be 
e postage paid, on receipt of price, 50 cents per volume. 
COVERS FOR VOLUME XXIII. (1889) NOW READY. 
FERRIS BROS., PUBLISHERS, 
7. COR. SIXTH AND ARCH STREETS, PHILADELPHIA, 
NOTICE TO CONTRIBUTORS 
— NATURALIST. 
