302 PHYSIOLOGICAL BOTANY. 



On the ApocynecB. By ALPHONSE DE CANDOLLE. Ann. 

 d. Scienc. natur., 3 ser. vol. i, p. 253. This paper is 

 referred to here, on account of the investigations which it 

 contains upon the stipules of this plant. 



Memoir e sur la Famille des Primulacees. By M. J. 

 E. DUBY. Geneva, 1844. Germination of the seeds of 

 Cyclamen, where the large tuber is directly formed, and 

 the cotyledons are not developed. 



Researches upon the Development and the Structure 

 of the PlantaginecB and Plumbagineae. By M. F. M. 

 BARNE'OUD. Compt. rend. 1844, ii, p. 262. I. Planta- 

 ginece. When the flowers are examined in their earliest 

 state, the development is found to occur from without 

 inwards, in opposition to Schleiden's theory. The flowers 

 at first consist of four tubercles, which have exactly the 

 form and structure of the anthers ; each also is furnished 

 with a bundle of spiral vessels, and they unite into a tube. 

 Hence the flower is a tube which supports the stamens, 

 as in the Gomphrenece and Acliyrantliea. The margins 

 of the valves of the ovary are at first some distance apart 

 from each other, and continue to approximate, but never 

 come completely into contact, hence there are no axile 

 bodies in the ovary of this order. 



II. Plumbaginece. The symmetry in this tribe appears 

 to be anomalous, because there is one row of stamens 

 which are opposite the petals. But the author has 

 discovered the rudiments of stamens in Plumbago mi- 

 crantha ; they, however, soon disappear, so that the row 

 of large stamens then forms the rule. 



Observations upon the Genus Aponogeton and upon its 

 Natural Affinities. By J. E. PLANCHON. Ann. d. Scienc. 

 natur., 3 ser., vol. i, 107. Also Compt. rend., 1844, 

 ii, 227. The author correctly separates this genus from 

 the Saurureae, and approximates it to the Alismacese. The 

 germination is very accurately described here. A single 



