PHANEEOGAMIA. 97 



the borders of the lake are a few mosses, lichens, grasses, and sedges ; 

 and where the broken, weathered pitch becomes looser, are found 

 Clusia, Chry sob aJ anus, Anona palmtris, Bromeliaeeae, Ferns, &c. A 

 catalogue is given of the genera, both of Phanerogams and Crypto- 

 gams, which have been observed by the author in the island. 



Datjbeny, Charles. — Remarks on the Final Causes of the Sexuality of 

 Plants, with particular reference to Mr. Darwin's Work on the Origin 

 of Species. Oxford, 1860. 8vo. 34 pages. With 1 plate. 



Dickie, Geoege. — The Botanist's Guide to the Counties of Aberdeen, 

 Banff, and Kincardine. Aberdeen, 1860. 1vol. 8vo. 344 pages. 

 A few observations on the physical features, and a summary of 

 the physical and geological structure of the counties, by Alexander 

 Cruikshank, are prefixed to the list of species. The altitudinal range 

 of the species, and the stations of the less common ones, are given. 



Duchaetee, P. — Recherches physiologiques, anatomiques, et organo- 



geniques sur la Colocase des Anciens Ann. Sc. Nat. Bot. Ser. iv., 



torn, xii., pp. 232-79. With 4 plates. 



The author's observations bear special reference to the remark- 

 able phenomenon of the secretion of water by the minute orifices at 

 the extremity of the leaves. M. Berthelot, at the author's request, 

 analyzed the excreted water, and found it almost absolutely pure ; 

 faint traces, only, of chloride of potassium, carbonate of lime, and 

 organic mucilage, were perceptible. M. Duchartre regards the emis- 

 sion of fluid to be directly due to diminished transpiration of the leaves : 

 that transpiration and aqueous excretion stand in inverse ratio to each 

 other, though at the same time they are but different manifestations 

 of the same physiological phenomenon. The author's anatomical 

 investigations were directed mainly to the system of canals in the sub- 

 marginal nerve-like thickening of the leaves, and to the orifices ter- 

 minating them, by which the water finds an exit. Examination of 

 the development and structure of the excretory orifices shows them 

 to be greatly altered and enlarged stomata. Minute observations 

 are appended on the development and rate of expansion of the leaf. 



Note sur deux Fleurs monstrueuses de Cattleya Forbesii, Lindh 



— Bull. Soc. Bot. de France, torn, vii., p. 257. 



In one of these flowers the segments of the perianth were re- 

 duced to five, the labellum and one of the lateral sepals being united 

 by their margins into a single large segment, the halves of which 

 were distinctly separated, as it were, by a longitudinal thick stripe of 

 bright yellow colour. Each of the united segments retained its cha- 

 racteristic colour, texture, and position * but while the sepal retained 

 its normal breadth, the labellum to which it was united acquired 

 but half its dimensions. Owing to this reduction of the labellum, 

 the unaltered column was entirely laid bare. The two petals were 

 but slightly altered, the most remarkable feature being, that the one 

 next to the monstrous labellum had contracted a close union with 

 the lower half of the column in the direction of its median line. 

 Both retained their normal position. Tn the upper flower of the 



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