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."