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absorb agriculture annual atmosphere average barley bottom bushels capillary water carbonic acid cent chlorophyll clay Cloth Columella conservation of energy Deanston defects depth diminished directions discharge distance ditch drain-gauges drainage and evaporation drainage water drained soil draining scoop draining spade drouth earth Ensilage estimated excavation exhaled experiments fall farm crops farm drainage farmers favorable field garden gauge Gisborne ground growing crops growth heat hygroscopic Illustrated important improved inches increased joints laid laying tiles less lupines measuring rod methods microbes moisture months nitrification nitrogen nutrition obstruction obtained one-half outlet percolate plant food porosity potential energy pots practical processes quartz sand quicksand rain rainfall readily relations retentive soils roots of plants Rothamsted season secure shears silt six inches soil metabolism summer supply temperature three feet tile drains tillage tion tons per acre trench water surface water table wheat
Página 34 - The law of conservation rigidly excludes both creation and annihilation. Waves may change to ripples, and ripples to waves, — magnitude may be substituted for number, and number for magnitude, — asteroids may aggregate to suns, suns may...
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Página 33 - The natural philosopher of to-day may dwell amid conceptions, which beggar those of Milton. So great and grand are they, that in the contemplation of them, a certain force of character is requisite to preserve us from bewilderment.
Página 68 - The removal, for a single summer night, of the aqueous vapour from the atmosphere which covers England, would be attended by the destruction of every plant which a freezing temperature could kill. In Sahara, where 'the soil is fire and the wind is flame, ' the refrigeration at night is often painful to bear.
Página 33 - ... through it the animal ; the lilies of the field are his workmanship, the verdure of the meadows, and the cattle upon a thousand hills. He forms the muscle, he urges the blood, he builds the brain. His fleetness is in the lion's foot ; he springs in the panther, he soars in the eagle, he slides in the snake. He builds the forest and hews it down, the power which raised the tree, and which wields the axe, being one and the same.
Página 34 - ... gain nor loss. This law generalizes the aphorism of Solomon, that there is nothing new under the sun, by teaching us to detect everywhere, under its infinite variety of appearances, the same primeval force. To nature nothing can be added ; from nature nothing can be taken away ; the sum of her energies is constant.