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374 374 BIBLIOGRAPHY.

blattrige Maranteen.— Mitth«? Euss. Gartenb. Ver. 1860. Heft 2. pp. 81-97.

Landeeek, Dr. — Botanische Mittheilungen aus Griechenland. Flora. 1860, pp. 705-713. Referring chiefly to economic products.

Lange, Joh. — Pugillus plantarum imprimis hispanicarum. 82 pp. 8vo. Copenhagen, 1860. (Ext. Nat. Videns. Med. 1860.)

Lawes, J. B., J. H. Gilbebt, and E. Pugh.— On the Sources of the Nitrogen of Vegetation, with special reference to the question whether Plants assimilate free or uncombined Nitrogen. (Abstract.) E. S. Proc. 21 June, 1860. pp. 16.

The experiments of the authors with certain Graminaceae and Leguminosae did not indicate the assimilation of free nitrogen by- plants.

Eurther investigations are required upon the question, and also as to the sources whence combined nitrogen may be derived by vegetation.

Lawson, Geokge. — Contributions to Microscopical Analysis : — Celas- trus scandens, L., with Eemarks on the Colouring Matters of Plants. Trans. Bot. Soc. Edinb. vi. pp. 362-8.

Eeferring to the histological character of the colouring sub- stance of the cells of the arillus, which occurs in the form of minute, elongated, and straight or curved granules of a bright scarlet colour.

Le Jolis, Aug. — Plantes vasculaires des environs de Cherbourg. Mem. Soc. Sc. Nat. Cherbourg, viii. pp. 245-360.

An account of the climate and general character of the vege- tation of the environs of Cherbourg is prefixed to the Catalogue of Species, — 954 in number, — which are arranged in conformity with the ' Elore de Erance' of Grenier and Godron.

Line-ley, John. — Descriptions of Coniferae sent from Japan, by J. G-. Veitch. Gard. Chron. 1861, pp. 22-3.

Livingstone, J. S.— On the Anaesthetic effects of Chloroform, Ether, and Amylene, on Sensitive Plants. Trans. Brit. Soc. Edinb. vi. p. 325.

The anaesthetic influence was found always to proceed from above downwards. The most marked effects were produced by amylene.

— — Experiments on the Effects of Narcotic and Irritant Gases on Plants. Trans. Bot. Soc. Edinb. vii. pp. 380-7.

Details are given of the effects of Sulphurous and Hydro- chloric Acid, Chlorine, Sulphuretted Hydrogen, Nitrous and Car- bonic Oxide, and Coal Gas, on Laburnum, Balsam, and a Psoralea. As regards their action on plants, the author distinguishes the two classes of narcotic and irritant gases. Plants exposed to the former until the leaves begin to droop, although the colour remains unchanged, inevitably perish. In irritant gases the action is more local, affecting first the tips of the leaves, which become disco-