מה אומרים אנשים - כתיבת ביקורת
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מהדורות אחרות - הצג הכל
1st prem acre adapted agricultural amount animals annual applied average become better branches bushels cattle cent City climate College common corn cost course cover crop cultivation early effect estimated expense experiments fact farm farmers feed feet field forest give given grain grass ground grow grown growth hand head important improvement increase industry interest Kansas kind labor land leaves less light loss manure material Michigan mineral nature necessary nitrogen Oregon period pine planted plot portion pounds practical present produce profit raising roots season seed seen shade sheep soil sorghum species specimens spring stand success sugar supply tion tree variety winter wood wool yield young
עמוד 9 - ... part of it, determined to let them grow, and they soon formed a flourishing grove. As soon as they were well grown, a fine spring appeared in place of the occasional rill, and furnished abundant water in the longest droughts. For forty or fifty years this spring was considered the best in the Clos du Doubs. A few years since, the grove was felled, and the ground turned again to a pasture. The spring disappeared with the wood, and is now as dry as it was ninety years ago.
עמוד 6 - It is the power to regulate ; that is, to prescribe the rule by which commerce is to be governed. This power, like all others vested in congress, is complete in itself, may be exercised to its utmost extent, and acknowledges no limitations other than are prescribed in the constitution.
עמוד 7 - States is generally ascribed to exhaustion of the soil ; but with greater reason it can be referred to the destruction of the forests which sheltered us from the cold winds of the north and west, and which, keeping the soil under their shade cool in summer and warm in winter, acted at once as material barriers and reservoirs of moisture.
עמוד 4 - ... bénédictions du pauvre. Un riche propriétaire ne peut faire valoir sa ferme et l'améliorer, sans répandre autour de lui l'aisance et le bonheur ; une végétation riche et abondante, une population nombreuse, l'image de la prospérité, sont la récompense de ses soins.
עמוד 10 - Becquerel, as quoted by Mr. Marsh, says : "In the valley of the Rhone a simple hedge, two metres in height, is sufficient protection for a distance of twenty-two metres.
עמוד 5 - American forest threatens us with new dangers. Every year renders it more imperative to provide some measures to check the evils which our predecessors in their ignorance have left us as a legacy with which to begin the second century of the Republic. It may not, then, be entirely without interest to examine briefly what the dangers are which follow the destruction of the forests, and the methods of counteracting them, which, so far as Massachusetts is concerned, are fully within our reach.
עמוד 9 - The spot is the middle of a very steep pasture, inclining to the south. Eighty years ago the owner of the land, perceiving that young firs were shooting up in the upper part of it, determined to let them grow, and they soon formed a flourishing grove. As soon as they were well grown, a fine spring...
עמוד 23 - The rapidity of its growth in all situations, and its economic value, make the Scotch pine the most valuable tree farmers can plant for screens and wind-breaks about their fields and buildings, and 'for this purpose it is recommended, in place of the more generally planted Norway spruce, which, though of rapid growth in its young state, does not promise, in our climate, at least, to fulfill the hopes which were formed in regard to it.
עמוד 18 - To develop its best qualities the white ash should be planted in a cool, deep, moist, but well-drained soil, where it will make a rapid growth. That the plantation may be as early profitable as possible, .the young trees should be inserted in rows three feet apart, the plants being two feet apart in the rows. This would give 7,260 plants to the acre, which should be gradually thinned until 108 trees are left standing, twenty feet apart each way. The first thinning, which might be made at the end...
עמוד 4 - ... lamb, 249 sheep, and 59 pigs. The percentages of water, mineral matter, fat, and nitrogenous substance, were determined in certain separated parts, and in the entire bodies, of ten animals — namely, one calf, two oxen, one lamb, four sheep, and two pigs. Complete analyses of the ashes, respectively, of the entire carcases, of the mixed internal and other ' offal ' parts, and of the entire bodies, of each of these ten animals have also been made.