240 Scientific Intelligence. 
me in number, and have exactly the same connections, direc- 
sa 
tions and relation to each other that they have in later life. But 
in the perfected frond we find them larger, longer and harder, 
and in the perfect stem the internodes are longer, the stem and 
bundles larger, while the whole plant has grown both longi- 
tudinally and laterally.” G. L. 
8. e Physiological significance of Water-glands and 
Nectaries ; b ALTER RDINER. (Proceedings of the Cam- 
bridge Philosophical Society, Nov. 12, 1883.)—These Water- 
the bundle and the cells of the gland, there are numerous tra~ 
cheids which form a transition from one to the other form of 
tissue. 
adding notes relative to the differences between these glands as 
they occur in monocotyledons and dicotyledons. o gradual 
stages betw hem be ected as yet, by comparative 
ancestor, and that there is not a gradual ascent from one group 
to the other. Gardiner further calls attention to the fact, but 
lar bundle and the free surface. In dicotyledons there are well 
developed glands in some plants like Callitriche, where we shoul 
me they cannot possibly be needed. In the glands of dicoty- 
ledons there is a very pronounced resistance to the escape of water, 
and a greater root-pressure is required to bring about exudation. 
lettin cells of the plant-tissue are also rendered mo 
turgid in consequence of the increased pressure, and the water is, a 
arenes. 
