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absorbed absorption alcohol amount appears assimilation atmosphere bark become calcic cambium carbonic acid cell-wall cellulose cent changes chemical chloride chlorophyll chlorophyll granules color coloring-matter containing cork cortex cotyledons crystals cutinized Darwin dicotyledons dilute dissolved ducts elements embryo epidermis evaporation examined experiments fascicles fibres fibro-vascular bundles film flower germination given glass glycerin grains green growth hairs hydrochloric acid inches instance iodine layer leaf leaves light liquid lower plants mass matters membrane micellae microscope minute monocotyledons movement nearly nitric acid nitrogen nucleus observed organs ovule oxygen parenchyma petiole Pfeffer plants pollen pollen-grains portion potassic hydrate produced protein protoplasm radial radicle rays reagents roots Sachs seedlings seeds shown side soil soluble solution sometimes species specimen starch stem stoma stomata structure substance sugar sulphuric acid surface temperature thickness thin threads tion tissues tracheids transpiration tube vegetable wall wood wood-cells woody yellow young
Page 416 - ... softer object, by which it is simultaneously pressed on opposite sides. If, however, the radicle is pressed by a similar object a little above the tip, the pressed part does not transmit any influence to the more distant parts, but bends abruptly towards the object. If the tip perceives the air to be moister on one side than on the other, it likewise transmits an influence to the upper adjoining part, which bends towards the source of moisture.
Page 223 - apd~ eminently characteristic quality of colloids is their mutability. Their existence is a continued metastasis. A colloid may be compared in this respect to water while existing liquid at a temperature under its usual freezing point, or to a supersaturated saline solution.
Page 416 - If the tip be lightly pressed or burnt or cut, it transmits an influence to the upper adjoining part, causing it to bend away from...
Page 301 - ... as an essential property of the gaseous condition of matter. According to the physical hypothesis now generally received, a gas is represented as consisting of solid and perfectly elastic spherical particles or atoms, which move in all directions, and are animated with different degrees of velocity in different gases.
Page 27 - ... the walls of the cells, in the form of a closed vesicle, which becomes more or less contracted, and consequently removes all the contents of the cell, which are enclosed in this vesicle, from the wall of the cell.
Page 224 - But, on the other hand, their peculiar physical aggregation with the chemical indifference referred to, appears to be required in substances that can intervene in the organic processes of life. The plastic elements of the animal body are found in this class.
Page 424 - Finally, it is impossible not to be struck with the resemblance between the foregoing movements of plants and many of the actions performed unconsciously by the lower animals.* With plants an astonishingly small stimulus suffices ; and even with allied plants one may be highly sensitive to the slightest continued pressure, and another highly sensitive to a slight momentary touch. The habit of moving at certain periods is inherited both by plants and animals; and several other points of similitude...
Page 346 - that Pinguicula vulgaris, with its small roots, is not only supported to a large extent by the extraordinary number of insects which it habitually captures, but likewise draws some nourishment from the pollen, leaves, and seeds of other plants, which often adhere to its leaves. It is therefore partly a vegetable as well as an animal feeder.
Page 417 - ... it. But as the growing stem lengthens and rises, the tendril might strike against it and be wound up around it. It never does. If we watch these slender Passion-flowers, which show the revolving so well in a sultry day, we may see, with wonder, that when a tendril, sweeping horizontally, comes round so that its base nears the parent stem rising above it, it stops short, rises stiffly upright, moves on in this position until it passes by the stem, then rapidly comes down again to the horizontal...
Page 458 - ... when the flowers of several of these plants were fertilized with the pollen of L. auratum precisely as their female parent had been fertilized. The. result was an extremely scanty crop of seed, " but there was enough to produce 8 or 10 young bulbs. Of these, when they bloomed, one bore a flower combining the features of both parents, but though large, it was far inferior to L. Parkmanni in form and color; the remaining flowers were not distinguishable from those of the pure L. speciosum.