Minerals. 
CABINET SPECIMENS 
AND COLLECTIONS. 
Our stock is the largest, finest, most complete in species, and in every way 
the best in the United States. We are the only firm in the country who 
confine their business exclusively to minerals. 
THE 15TH EDITION OF OUR CATALOGUE 
will be issued about June ist, as a handsomely illustrated 72-page volume. 
It will be sent/r^e to all persons mentioning this Journal. 
GEO. L. ENGLISH & CO. 
DEALERS IN MINERALS, 
15 1 2 Chestnut Street, Philadelphia, Pa. 
SYNOPSIS OF THE FAMILIES 
OF VERTEBRATA. 
BY PROF. E. D. COPE. 
This article, which was printed in the American Naturalist 
for October, 1889, has been issued in separate (dtm by the 
publishers, for the use of lecturers, instructors and okrs who 
may have use for it, and will be sent by mail, postpaid, on 
receipt of 25 cents. 
FERRIS BROS., Publishers, 
S. W. Cor. Sixth and Arch Streets, Phila- 
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