Page:Natural History Review (1861).djvu/379

Rh PHAKEROGAMIA.

in of the primary cell-wall all round. Its further formation results, in part, from the extension of this projecting fold, in part from the deposition of thickening layers around it. The original membrane dividing two opposed pores, becomes absorbed when the adjacent cells contain air, and persists in those which continue to be filled with fluid.

Dresser, C. — The Morphological Import of certain Vegetable Or- gans. Trans. Bot. Soc. Edinb. vi pp. 321-2.

The Stem or Axis as the Fundamental Organ in the Vege- table Structure. 1. c. pp. 432-4.

Duchartre, P. — Note sur le Lilas blanchi par la culture forcee. Bull. Soc. Botan. Tom. vii. pp. 152-4.

Dufotjr, Leox. — De la valeur historique et sentimentale d'un her- bier. Souvenirs d'Espagne (Suite). Bull. Soc. Botan. Tom. vii. pp. 146-151, 169-173.

Diagnoses et Observations critiques sur quelques plantes

d'Espagne malconnues ou nouvelles. Bull. Soc. Botan. Tom. vii. pp. 221-7, 240-7, 323-328, 347-352.

Eng-el, L. C. — Influence des climats et de la culture sur les pro- prietes medicales des plantes. 35 pp. 4to. Strasburg, 1860.

Fermokd, Ch. — Note sur les fruits et l'ecorce du Sapindus divari- catus du Bresil. Bull. Soc. Botan. Tom. vii. pp. 214-219.

A detailed account is furnished of the fruit, seed, and bark of this Sapindus, sent from Brazil as the produce of a tree called the " Savonnier" or " Arlre-a-savon ;" the " Pao-de-Sabao" men- tioned by M. Guibourt in " Hist, Nat. des Drogues."

Eremt, E. — Eecherches sur la matiere colorante verte des Eeuilles. Ann. S. N. Ser. iv. (Bot.) Tom. xiii. pp. 45-53.

M. Eremy resolves the colouring matter of chlorophyll into blue and yellow elements by treatment with a mixture of ether and dilute hydrochloric acid. The blue substance he calls phyllo- cyanine ; the yellow, pkylloxanthine. The latter is the more stable element, and is found in autumnal as well as nascent leaves, from which phyllocyanine is absent.

Garcke, A.' — Ueber die Stellung von Plagianthus and Hoheria in Natiirlichen Systeme. Bonplandia, 1860, pp. 365-7.

Confirms the relation of these genera to Malvaceae by the structure of the pollen granules, which are dotted with the warts characteristic of this Order : not smooth as in Sterculiaceae.

Gay, J. — Le Printemps de 1860, compare a celui de 1859, dans son eflet sur la floraison de quelques plantes observees a Paris. Bull. Soc. Botan. Tom. vii. pp. 307-8.

Elowering was retarded in the case of the nine species (of Ajacc, Narcissus, and Syringa intermedia) observed from 12 to 31 days.

Nouvelles observations sur la Couronne des Narcissees. 1. c.

pp. 309-16. With woodcuts.

From an examination of some partially double flowers of JS r ar-

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