366 BIBLIOGEAPHY.
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A list of the parent species of 40 hybrids is given, belonging to the following genera, viz. : — Dianthus, Lychnis, Silene, OEno- thera, Lobelia, Nicotiana, Verbascum, and Digitalis.
Costa, A. C. — Index Seminum in horto botanico Archigymnasii Barcinonensis. Ann. S. N. ser. iv. (Bot.) Tom. xiii. pp. 103-5.
Cetjoee, H. — Die Entwickelung der Blume von Napoleona imperials, Beauv. Bot. Z. 1860, 361-6. With figures.
The double corona and the discoid ring surrounding the pistil originate subsequent to the development of the staminal whorl ; the inner corona is adnate below with the filaments. The affini- ties of Napoleona are discussed.
Einiges ueber die Gewebsveranderungen bei der Fortpflan-
zung durch Stecklinge. Bot. Z. 1860, 369-374. "With 1 plate.
Ceockee, C. W. — Notes on the Germination of certain species of Cyrtandreae. Linn. Proc. v. pp. 65-7. With 1 plate.
The cotyledons of Streptocarpus polyanthus at first equal, be- come in a few days after germination remarkably unequal, the larger continuing its expansion until it attains frequently a foot in length, constituting usually the only leaf of the plant. A simi- lar development of one cotyledon is exhibited by S. JRexii and S. biflorus. Mr. Crocker's observations agree with those pre- viously published by Dr. Caspary.
Cuzent, G. — Tahiti. Eecherches sur les principales productions vegetales de Tile. 8vo. pp. 275. Paris, 1860. V. Masson.
Daeach, De. — Plants flowering in the neighbourhood of Philadel- phia during the months of July, August, September and October. Phil. Acad. Proc. 1860, pp. 511-515.
Delavaud, C. — Fleurs soudees et peloriees de Linaria striata. Bull. Soc. Botan. Tom. vii. pp. 174-5.
Dickson, Alexaitoee.— On some Bisexual Cones occurring in the Spruce Fir (Abies excelsa). Trans. Bot. Soc. Edinb. vi. pp. 418-423.
The lower portion of these cones was covered with stamens, the upper producing bracts and scales as in normal female cones. Dr. Dickson found the bracts of the terminal portion to be seri- ally continuous with the stamens of the lower part.
Dippel.— Ueber die Entstehung und den Bau der Tiipfel. 1. Die Tiipfel der Holz und Geiasszellen. 2. Die Tiipfel in den Quer- wanden dikotyler GefasszeUen. Bot. Z. 1860, pp. 329-336. With 2 plates.
The development of the "pits" or " pores" on the wood-cells and vessels, takes place in a similar manner in all plants provided with them, which were examined by the author. He selects Pinus as especially suited for their study, from the large size of the pits, and its ready accessibility. The " pit" (Tiipfel), which is a closed pore widened at its base, is first formed by a folding-
