370 BIBLIOGEAPHY.
Phlebot&nia (Poly galeae), Ditto, (Euphorbiaceae), Carpodiptera (Bombacese), Bheedia (Guttiferse), Gyrotcenia (Urticacese), Lino- dendron (Thymelese), are the new genera described.
Halliee, Eenst. — Bewegung der Pflanzen gegen verschiedene Licht- quellen, beobachtet nnd gemessen an Ornithogalum caudatum, Ait.-Plora, 1860, pp. 689-694.
Herr Hallier found the scape more susceptible to reflected than to direct solar light. It was similarly affected by artificial light, the stem bending rather towards a sheet of white paper than to the taper illuminating it.
Hanstein, Johannes. — Versuche uber die Leitung des saftes durch die Einde und Polgerungen daraus. Pringsheim's Jahr- bucher fur Wiss. Botanik. Bd. ii. pp. 392-467.
The subject is discussed under the several heads of, (1.) Can the roots nourish themselves ? or whence and in what manner do they receive assimilated nutrient matter ? (2.) Can leaves alone assimilate nutriment ? or what is required besides them to effect this ? (3.) By what channel does the plastic sap ascend to its destination ? (4.) What has the bark to do with the passage of re- dissolved substances which have been in reserve, and of assimilated sap ? (5.) Which are especially the sap-conducting tissues of the bark ? Among the general results of the author's enquiries are the following. Both roots and leaves together, must effect the assimilation of the various nutrient elements which they each take up ; neither can, apart from the other, assimilate. The sap is conveyed from the root to the leaves by the wood, the bark alone serves as the return channel for the assimilated matter. In uninjured plants the bark directly conveys, both upwards and downwards, the plastic sap derived from the leaves, and without the supply of this channel neither are the leaf-buds developed, the fruits matured, or the elements of the wood duly thickened. The bark also appears to be concerned in re-conveying to the buds dissolved reserve-nutriment. The unthickened bundles of liber- cells (BastrShren) probably serve as the principal special cortical system, conveying the plastic sap ; the cambium layer itself would seem to take as little part in the descent of formative sap as it does in the upward flow of the wood-sap.
Haetingee, Ant. — Oesterreich's u. Deutschland's wildwachsende od. Garten gezogene Giftpflanzen. Nothwendiger Atlas zu Adf. JNrtsche's Giftpflanzenbuch u. Giftpflanzen-Kalender, in natur- getreuen Abbildgn. 1. Lfg. gr. Pol. (4 chromolith. Blatt.) Wien, (Wallishausser's B.)
Heee, Oswald. — Untersuchungen tiber das Klima und die Vegeta- tionsverh'altnisse des Tertiaren landes. (Separatabdruck aus Bd. iii. d. tertiaren Plora der Schweiz). Winterthur, 1860.
Heney, Aime. — TJeber die Bildung der Wurzelfasern von Sedum Telephium, S. maximum und 8. Fabaria. With 2 plates. Bonn. Yerhand, d. N. H. V. 1860, pp. 1-12.
