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. 



