477

Philadelphia, October 1st, 1880.
Dear Sir:
We desire to call your attention to our

NEW BOTANICAL SERIES,

consisting of 24 microscoping preparations (mostly double stained), illustrating
the structure of the higher orders of plants. They are all neatly mounted
on 3x1 slides, and will, we feel sure, be found valuable for private study as
well as for class demonstration. The following is a list of the structures and
cell contents shown:

1. Protoplasm and Nucleus in cells of Cypripedium pubescens
2. Simple Cellular Tissue, Parenchyma, in Stem of Elder
3. Parenchyma, Stellate form, in Rush, Juncus tennis
4. Woody Tissue in White Oak. Quercus alba, 2 sections.
5. Pitted Wood-cells, in White Pine. radial section
6. Annular Vessels in Impatiens fulva.
7. Spiral Vessels in Castor-oil plant.
8. Pitted Vessel in stem of Nerium Oleander
9. Scalariform Vessels in Fern, Osmunda.
10. Medullary Rays, in stem of Mahogany, 2 sections
11. Endogenous Stem, Smilax rotundifolia.
12. Laticiferous Tissue, in Leaf of Rhynospermium
13. Stomata, in Leaf of Cypripedium acaule.
14. Rootlet of Lemna, showing Root-cap, etc.
15. Stellate Hairs, on Leaf of Deutzia graeilis.
16. Stinging Hairs of Nettle, Urtica dioica.
17. Internal Hairs, in Water-lily, Nymphaea odorata
18. Glandular Hairs on Leaf of Sundew, Drosera.
19. Oil-gland, in cuticle of Lemon
20. Chlorophyll grains in Leaf of Moss, Hypnum.
21. Starch Grains, in Canna root.
22. Aleurone, Proteine grains, in Seed of Ricinus
23. Raphides, in Leaf of Fuchsia.
24. Cystoliths, in Leaf of Fieus elastica, section

Price, in neat polished Case, with four trays. $15.00.

Our stock of Optical, Mathematical and Philosophical Instruments is
the largest and most varied to be found in the United States and is con-
stantly receiving accessions of improvements and novelties.
Our complete Catalogue sent by mail, on application, as follows:

Part 1st, Mathematical Instruments, 160 pages.
Part 2d, Optical Instruments. 188 "
Part 3. Magic Lanterns, and Slides, 150 "
Part 4th Philophical Instruments, 188 "

Respectfully Yours.
JAMES W. QUEEN & CO.,
Opticians,
924 Chestnut Street,
Philadelphia