Farther Inquiries Into the Changes Induced On Atmospheric Air By the Germinatio
Farther Inquiries Into the Changes Induced On Atmospheric Air By the Germinatio
Daniel Ellis
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But it is in the same part of the plant that its colourable juices reside, and these juices, also, acquire their green colour from the di- Ill rect influence of the sun ; so that the decomposition of carbonic acid, and the formation of the green colour, not only occur at the same time, and in the same place, but they are accomplished by the imme- diate operation of the same powerful agent. There exists, says M. Senebier, a very singular relation be- tween the parts of leaves which furnish most ...air, and those of etiolated leaves which first become green. It is in the angles formed by the nerves of the leaves that we observe these two phenomena. It is in these that the excretory vessels of the parenchyme termi- nate, and it is there that light announces its operation, as we see by the air which this part affords, and by the green colour which at the same time it assumes *. 353. But not only do these operations appear thus to go on at the same time, and in the same part of the plant, but they seem to have a near connec- tion with each other ; for it is only by the green parts of vegetables that oxygen gas is afforded j while all their other parts yield only an impure air.
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