schiehallion experiment conducted experiments to determine how much earth weighs.
schiehallion experiment conducted experiments to determine how much earth weighs.
who conducted experiments to determine how much earth weighs?
schiehallion experiment
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jethro tull considered soil to be the sole food of plants. "too much nitre," tull tells us, "corrodes a plant, too much water drowns it, too much air dries the roots of it, too much heat burns it; but too much earth a plant can never have, unless it be therein wholly buried: too much earth or too fine can never possibly be given to their roots, for they never receive so much of it as to surfeit the plant." again, he declares elsewhere, "that which nourishes and augments a plant is the true food of it. every plant is earth, and the growth and true increase of a plant is the addition of more earth." and in his chapter on the "pasture of plants", tull told his readers with great gravity that "this pasturage is the inner or internal superficies "[sic]" of the earth; or, which is the same thing, it is the superficies of the pores, cavities, or interstices of the divided parts of the earth, which are of two sorts, natural and artificial. the mouths or lacteals of roots take their pabulum, being fine particles of earth, from the superficies of the pores or cavities, wherein their roots are included."
jethro tull (agriculturist)