DR. McCOOK'S SCIENTIFIC BOOKS.
"American Spiders and their Spinningwork."
Vols. I, II, III, quarto, with 36 plates colored by hand from nature, and 853 original engravings.
Price, $50.00 net per set.
"The Agricultural Ant of Texas."
Octavo, pp. 311, plates xxiv.
Price, $3.00.
"The Honey and Occident Ants."
Octavo, pp. 188, plates xiii.
Price, $2.00.
The above named works are so well and favorably known to naturalists that they have become scientific classics in their department. We will forward them by mail to any address for the above prices.
"The Moundmaking Ants of the Alleghenies."
Octavo pamphlet, pp. 50, plates v.
Price, 75 cents.
We have a few copies of this work, reprinted from the Proceedings of the American Entomological Society, which are now offered for sale.
GEO. W. JACOBS & CO.,
No. 103 S. 15th St., Philadelphia.