280 PHYSIOLOGICAL BOTANY. 



On the Saccharine Glands of Leaves. By UNGER. 

 Flora, 1844, p. 703. In many Acacias, as A. longifolia, 

 armata, verticittata, and myrtifolia, the author saw a 

 saccharine fluid drop away ; and on careful examination, 

 found at the base of the phyllode, close to the thickening 

 at its upper margin, a small punctiform depression, which 

 is the excretory duct of a slit-like cavity in the substance 

 of the phyllode. This cavity is surrounded by peculiar 

 cells with thin walls, which collectively form a glandular 

 apparatus, in which the saccharine fluid collects, and 

 from which it is gradually evacuated. There are two 

 vascular bundles connected with the saccharine glands, 

 and giving branches to them, the vessels of which are in 

 short joints and curved, and in this manner are lost in 

 the parenchyma of the circumference. The author sub- 

 joins some observations, principally relating to the honey- 

 like secretions from the leaves and branches caused by 

 insects. 



On the Propagation of Cardamine pratensis L., by 

 Means of its Leaves. By JUL. MUNTER. Bot. Zeit., 

 1845, p. 537. The author accurately describes the de- 

 velopment of young plants from the leaves of Cardamine 

 pratensis, for the most part after Cassini, whose accuracy 

 Schleiden has rendered doubtful. The hemispherical 

 nodule, from which the plants are developed, occurs at 

 the spot where the three principal nerves of the leaflets 

 radiate from each other into the leaf. The roots spring out 

 on the upper side, at first grow upwards, and afterwards, 

 when they have acquired sufficient length, descend. In 

 addition to this, a second bud frequently arises from the 

 middle of the central rib. The most remarkable point is 

 the confirmation of Cassini's observation, that the leaves 

 of Cardamine pratensis separate, live under water, and 

 there emit young plants. The author found that the 

 chlorophyll disappeared then, and considers justly that it 

 probably serves for the nutrition of the plant. 



M. Pietro Savi has also observed the development of 

 young plants upon the leaves of Cardamine pratensis in 



