By WM. A. RILEY, Ph. D., Professor of Insect Morphology and Parasitology in Cornell University and O. A. JOHANNSEN, Ph. D., Professor of Biology in Cornell University.
A concise account of poisonous, and disease-carrying insects and their allies, including descriptions and illustrations of the principal species, with keys for their determination, and method of control. Bound Library Buckram, medium 8vo. Nearly 375 pages. Price $2.00 net.
The Comstock Publishing Company
Cornell Heights, Ithaca, N. Y.
It affords this establishment pleasure to state that though we are over fifty years old we are still seeking with youthful energy new finds of choice mineral specimens.
A few of our recent additions will show from what widely distributed areas we draw:
| Japan: | Chalcopyrite in groups of sharp crystals, some of them beautifully iridescent. |
| Stibnite, brilliant crystals, 5 to 8 inches long. | |
| Hokutolite, a new radio-active barium-lead silicate. | |
| Reinite, in large, sharp crystals. | |
| Quartz Twins, fine, large crystals. | |
| Rhodesia: | Malachite, beautiful polished specimens showing concentric banding. |
| Hopeite, in small groups of excellent crystals. | |
| Madagascar: | Betafite, a new uranium niobate, in good crystals. |
| Euxenite, good crystals. | |
| Beryl, in large brown crystals with pyramidal faces. | |
| California: | Tourmaline, polished transverse sections of large crystals of rich red and green colors. |
| Kunzite, superb gem crystals. | |
| Benitoite and Neptunite in fine crystals and groups. | |
| Greenockite on Magnetite, uncommonly good. | |
| Utah: | Willemite, drusy masses of colorless and red crystals. |
| Aurichalcite, singularly beautiful robin’s-egg blue, crystallized coatings. | |
| Nova Scotia: | Magnesite in groups of small distinct hexagonal crystals. |
New lots of fine specimens are constantly arriving. Ask for price-list No. 160.