PHYSIOLOGICAL BOTANY. 307 



As regards the Algae, descriptive coincides so closely 

 with physiological botany, that the two must be arranged 

 near each other. We find, in the ' Annals of Natural 

 History/ vol. xiii, p. 375, RALFS, On British Desmidete ; 

 vol. xiv, p. 240, DAY. LANDSBOROUGH, On the Fructifi- 

 cation of Gloiosiphonia Capillaris ; ibid. pp. 256, 361, 

 On British Desmidea continued. 



The following papers are important as regards the 

 description of the Algae : On the Structure of Ctenodus, 

 Delisea, and Lenormandia. By M. MONTAGNE. Annal. d. 

 Sc. nat., 38, vol. i, p. 151. Note upon some Alga with 

 reticulated Fronds. By M. J. DECAISNE. Ibid. vol. ii, 

 p. 233. Note tipon the mode of Reproduction of Nostoc 

 verrucosum. By M. GUST. THURET. Ibid. p. 319. Ob- 

 servations on the Tetraspora. By M. M. CROUAN. Ibid, 

 p. 365. 



On the Colour of the Red Sea. By M. MONTAGNE. 

 Ann. des Sc. nat., vol. ii, p. 332. Account of it, and 

 confirmation of Ehrenberg's earlier investigations. It is 

 produced by an Alga, which Ehrenberg denominated 

 Trichodesmium erythraceum. 



On the genus Ceramium and some of its Species. By 

 Prof. MENEGHINI. Giorn. Encicl., i, p. 178. A cri- 

 ticism of Kiitzing's Memoir in the 'Linnaea/ vol. xv. 

 Professor Meneghini works principally at the Algae. 



On the History of the Development of Chara. By 

 C. MULLER. Botan. Zeit. 1845, p. 393 et seq. The 

 formation of cells has been treated of at some length 

 above. This paper principally consists of a history of 

 the development of the cells of Char a from cytoblasts. 



On Hamatococcus pluvialis. By J. V. FLOTOW. In 

 the Memoirs of the Royal Academy of Naturalists, b. xii, 

 sect. 2, p. 413. An important memoir. The author 



