Physiological Botany: I. Outlines of the Histology of Phænogamous Plants
Physiological Botany: I. Outlines of the Histology of Phænogamous Plants
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The method of determining the amount of water held b}' the cell-walls of dry wood is the following : — A thin cross-section of fresh wood is hung up in dry air until it ceases to lose weight During drying a crack appears, run- ning from the centre to the circumference. After ascertaining the weight of the disc thoroughly diied (at 100® C), the wood is suspended in a saturated atmosphere until enough water is Digitized by Google 262 TRANSFER OF WATER TUROUGU THE PLANT.
absorbed to cause a swelli...ng of the tissues and a closing of the crack. In this condition it is safe to assume that the cell-walls themselves are saturated, but that there is no liquid water in the cavity of the cells. The difference between the weight of the dry and that of the saturated disc gives the weight of the water taken up and held ; this, converted into volume, is found to be approximately one half that of the space occupied by the cell- wall itself.
702. The water which is taken up in relatively small amount and held in the micellar interstices of lignified cell- wall is in the state of equilibrium previously described.
What to read after Physiological Botany: I. Outlines of the Histology of Phænogamous Plants?
You can find similar books in the "Read Also" column, or choose other free books by George L George Lincoln Goodale to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The method of determining the amount of water held b}' the cell-walls of dry wood is the following : — A thin cross-section of fresh wood is hung up in dry air until it ceases to lose weight During drying a crack appears, run- ning from the centre to the circumference. After ascertaining the weight of the disc thoroughly diied (at 100® C), the wood is suspended in a saturated atmosphere until enough water is Digitized by Google 262 TRANSFER OF WATER TUROUGU THE PLANT.
absorbed to cause a swelli...ng of the tissues and a closing of the crack. In this condition it is safe to assume that the cell-walls themselves are saturated, but that there is no liquid water in the cavity of the cells. The difference between the weight of the dry and that of the saturated disc gives the weight of the water taken up and held ; this, converted into volume, is found to be approximately one half that of the space occupied by the cell- wall itself.
702. The water which is taken up in relatively small amount and held in the micellar interstices of lignified cell- wall is in the state of equilibrium previously described.
What to read after Physiological Botany: I. Outlines of the Histology of Phænogamous Plants?
You can find similar books in the "Read Also" column, or choose other free books by George L George Lincoln Goodale to read onlineMoreLess
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