Outlines of Botany for the High School Laboratory and Classroom: (based on Gray's Lessons in Botany)American book Company, 1901 - 272 strani |
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Algæ anther antheridia antherozoids archegonia arrangement axils axis Bacteria bark bearing become blade Botany bracts branches buds calyx carbon carpels chlorophyll coats color common compound microscope corolla corymb cotyledons cross section Cryptogams dehiscence diagram Draw egg cell embryo Examine EXERCISE Experiment Ferns fertilization filaments floral flower cluster Flowering Plants foliage fruit Fungi germination green growing growth hand lens inflorescence insects laboratory layer leaf leaflets leaves Liverworts lobed material Mosses Note oögonia oöspore organs ovary ovule oxygen palmately petals petiole Phanerogams pinnately pistil placenta plant body pollen portion prothallium protoplasm pupils receptacle reproduction root hairs rounded sacs scales seed seedling seen sepals shoot side simple soil species spike sporangia sporangium spores spring stalk stamens starch stem stigma structure substances surface tendril termed thallus thickened tion tissue trees tube twigs upper Vaucheria vegetable veins walls wood zoospores
Priljubljeni odlomki
Stran 63 - I never saw a Big Tree that had died a natural death; barring accidents they seem to be immortal, being exempt from all the diseases that afflict and kill other trees. Unless destroyed by man they live on indefinitely until burned, smashed -by lightning, or cast down by storms, or by the giving way of the ground on which they stand.
Stran 55 - ... than once gone on purpose, during a gale, to watch a Bryony growing in an exposed hedge, with its tendrils attached to the surrounding bushes; and as the thick or thin branches were tossed to and fro by the wind, the attached tendrils, had they not been excessively elastic, would have been instantly torn off and the plant thrown prostrate.
Stran 55 - Bryony growing in an exposed hedge, with its tendrils attached to the surrounding bushes ; and as the thick and thin branches were tossed to and fro by the wind, the tendrils, had they not been excessively elastic, would instantly have been torn off and the plant thrown prostrate. But as it was, the Bryony safely rode out the gale, like a ship with two anchors down, and with a long range of cable ahead to serve as a spring as she surges to the storm.
Stran 236 - The albuminous substances which compose protoplasm differ from the carbohydrates produced by assimilation, in containing a considerable proportion of nitrogen often with some sulphur and phosphorus. It is in the formation of these nitrogenous, or albuminous, matters that the nutrient mineral salts are put to use. Where this final step in the production of proteid matter is taken is not definitely known. It may be that it is in the green tissue of the leaf, or it may be at all growing points.
Stran 53 - ... whilst very young, may be seen to bend to one side and to travel slowly round towards all points of the compass, moving, like the hands of a watch, with the sun. The movement very soon acquires its full ordinary velocity. From seven observations made during August on shoots proceeding...
Stran 55 - ... object, and curve towards the touched side. With several plants a single touch, so slight as only just to move the highly flexible tendril, is enough to induce curvature. Passiflora...
Stran 64 - ... years), though not a very old-looking tree. It was felled to procure a section for exhibition, and thus an opportunity was given to count its annual rings of growth. The colossal scarred monument in the Kings...
Stran 149 - ... to the pistil itself (333). 343. Secondly, as to fruits which are partly fleshy and partly hard, one of the most familiar kinds is 344. The Drupe, or Stone-fruit ; of which the cherry, plum, and peach (Fig. 285) are familiar examples. In this the outer part of the thickness of the pericarp becomes fleshy, or softens, like a berry, while the inner hardens, like a nut. From the way in which the pistil is constructed (305), it is evident that the fleshy part here answers to the lower, and the stone...
Stran 64 - The wood-rings in the section I laid bare were so involved and contorted in some places that I was not able to determine its age exactly, but I counted over 4,000 rings, which showed that this tree was in its prime, swaying in the Sierra winds, when Christ walked the earth. No other tree in the world, as far as I know, has looked down on so many centuries as the Sequoia, or opens such impressive and suggestive views into history.
Stran 94 - Awn-pointed, and Bristle-pointed, are terms used when this mucronate point is extended into a longer bristle-form or slender appendage. The first six of these terms can be applied to the lower as well as to the upper end of a leaf or other organ. The others belong to the apex only. 140 ui 138.