Because it is formed by branches of those returning vessels that deposit the new alburnum. From Wordnik.com. [The Mirror of Literature, Amusement, and Instruction Volume 19, No. 529, January 14, 1832] Reference
This consists in cutting a ring round the tree with axes through the bark and sapwood, or alburnum, into the brown wood beneath. From Wordnik.com. [Australia, The Dairy Country] Reference
Incisions are made into the alburnum of the seringueiras; below the wound small pots are attached, which twenty-four hours suffice to fill with a milky sap. From Wordnik.com. [Eight Hundred Leagues on the Amazon] Reference
Wood is composed of duramen or heartwood, and alburnum or sapwood, and when dry consists approximately of 49 per cent by weight of carbon, 6 per cent of hydrogen, 44 per cent of oxygen, and 1 per cent of ash, which is fairly uniform for all species. From Wordnik.com. [Seasoning of Wood] Reference
The growth of the trunk or stem of all exogenous plants, or those which increase in size on the outside of the stem, is brought about by the descent of certain formative tissue called cambium, elaborated by the leaves and descending between the old wood and the bark, where it is formed into alburnum or woody matter. From Wordnik.com. [Scientific American, Volume XLIII., No. 25, December 18, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures.] Reference
It is through the tubes of the living alburnum that the sap rises. From Wordnik.com. [Conversations on Chemistry, V. 1-2 In Which the Elements of that Science Are Familiarly Explained and Illustrated by Experiments] Reference
It is the bark and a part of the alburnum which contain this terrible poison. From Wordnik.com. [Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2] Reference
That function is performed by the tubes of the alburnum, or wood, which is immediately beneath the cortical layers. From Wordnik.com. [Conversations on Chemistry, V. 1-2 In Which the Elements of that Science Are Familiarly Explained and Illustrated by Experiments] Reference
The tree was evidently hollow throughout its length; but perhaps some portion of the alburnum still remained intact. From Wordnik.com. [Godfrey Morgan A Californian Mystery] Reference
The mixture of bark and alburnum was next placed upon a smooth stone, and mashed into a fibre of a yellowish colour. From Wordnik.com. [The Forest Exiles The Perils of a Peruvian Family in the Wilds of the Amazon] Reference
Guapo with his knife first scraped all the bark, as well as the alburnum or white coating, from the rods, which last he flung away. From Wordnik.com. [The Forest Exiles The Perils of a Peruvian Family in the Wilds of the Amazon] Reference
From the roots the sap ascends through the tubes of the alburnum into the stem, and thence branches out to every extremity of the plant. From Wordnik.com. [Conversations on Chemistry, V. 1-2 In Which the Elements of that Science Are Familiarly Explained and Illustrated by Experiments] Reference
I believe, in a great measure owing to its having very little heart-wood, the alburnum preserving its vital functions longer than in other trees. From Wordnik.com. [Conversations on Chemistry, V. 1-2 In Which the Elements of that Science Are Familiarly Explained and Illustrated by Experiments] Reference
The oldest, and consequently most internal part of the alburnum, is called heart-wood; it appears to be dead, at least no vital functions are discernible in it. From Wordnik.com. [Conversations on Chemistry, V. 1-2 In Which the Elements of that Science Are Familiarly Explained and Illustrated by Experiments] Reference
The calyx of a flower, he says, is an expansion of the outer bark, the petals proceed from the inner bark or rind, the stamens from the alburnum or woody circle, and the style from the pith. From Wordnik.com. [The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation] Reference
If incisions are made into the alburnum and cortical layers, may not the ascending and descending sap be procured in the same manner as the peculiar juice is from the vessels of the parenchyma?. From Wordnik.com. [Conversations on Chemistry, V. 1-2 In Which the Elements of that Science Are Familiarly Explained and Illustrated by Experiments] Reference
The sap-juice which rises in the vernal months from the roots of trees through the alburnum or sap-wood, owes its sweetness I suppose to a similar digestive power of the absorbent system of the young buds. From Wordnik.com. [The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation] Reference
It was probably an effect of the season, for Knight states that he never could discover the least trace of saccharine matter during winter in the alburnum either of the stem or of the roots of the sycamore. From Wordnik.com. [Resources of the Southern Fields and Forests, Medical, Economical, and Agricultural. Being also a Medical Botany of the Confederate States; with Practical Information on the Useful Properties of the Trees, Plants, and Shrubs] Reference
The giant's heart had disappeared, the alburnum had been dissipated into soft whitish dust; but if the tree did not depend so much on its powerful roots as on its solid bark, it could still keep its position for centuries. From Wordnik.com. [Godfrey Morgan A Californian Mystery] Reference
In dicotyledonous plants its main current is through the liber, or inner portion of the bark, but it also descends through the alburnum or most recently formed wood, through which, in the same plants, flows the main current of the ascending sap. From Wordnik.com. [Theism: The Witness of Reason and Nature to an All-Wise and Beneficent Creator.] Reference
When he saw that Madame Delmare was obliged to make an effort to listen to him, he held his peace, and naught could be heard save the innumerable little voices whispering in the burning wood, the plaintive song of the log as it becomes heated and swells, the crackling of the bark as it curls before breaking, and the faint phosphorescent explosions of the alburnum, which emits a bluish flame. From Wordnik.com. [Indiana] Reference
Who knows what beautiful and winged life, whose egg has been buried for ages under many concentric layers of woodenness in the dead dry life of society, deposited at first in the alburnum of the green and living tree, which has been gradually converted into the semblance of its well-seasoned tomb -- heard perchance gnawing out now for years by the astonished family of man, as they sat round the festive board -- may unexpectedly come forth from amidst society's most trivial and handselled furniture, to enjoy its perfect summer life at last!. From Wordnik.com. [Walden] Reference
Who knows what beautiful and winged life, whose egg has been buried for ages under many concentric layers of woodenness in the dead dry life of society, deposited at first in the alburnum of the green and living tree, which has been gradually converted into the semblance of its well-seasoned tomb — heard perchance gnawing out now for years by the astonished family of man, as they sat round the festive board — may unexpectedly come forth from amidst society's most trivial and handselled furniture, to enjoy its perfect summer life at last!. From Wordnik.com. [Walden~ Chapter 18 (historical)] Reference
Who knows what beautiful and winged life, whose egg has been buried for ages under many concentric layers of woodenness in the dead dry life of society, deposited at first in the alburnum of the green and living tree, which has been gradually converted into the semblance of its well-seasoned tomb, -- heard perchance gnawing out now for years by the astonished family of man, as they sat round the festive board, -- may unexpectedly come forth from amidst society's most trivial and handselled furniture, to enjoy its perfect summer life at last!. From Wordnik.com. [Walden, or Life in the woods] Reference
Besides these absorbents in the roots of plants there are others which open their mouths on the external surfaces of the bark and leaves, and on the internal surfaces of all the cells, and between the bark and the alburnum or sap-wood; the existence of these is shewn, because a leaf plucked off and laid with its under side on water will not wither so soon as if left in the dry air, -- the same if the bark alone of a branch which is separated from a tree be kept moist with water, -- and lastly, by moistening the alburnum or sap-wood alone of a branch detached from a tree it will not so soon wither as if left in the dry air. From Wordnik.com. [The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation] Reference
In the Fagus sylvestris, white beech, "the duramen or perfect wood, bears a remarkably small proportion to its alburnum. From Wordnik.com. [Resources of the Southern Fields and Forests, Medical, Economical, and Agricultural. Being also a Medical Botany of the Confederate States; with Practical Information on the Useful Properties of the Trees, Plants, and Shrubs] Reference
Who knows what beautiful and winged life, whose egg has been buried for ages under many concentric layers of woodenness in the dead dry life of society, deposited at first in the alburnum of the green and living tree, which has been gradually converted into the semblance of its well-seasoned tomb — heard perchance gnawing out now for years by the astonished family of man, as they sat round the festive board — may unexpectedly come forth from amidst society’s most trivial and handselled furniture, to enjoy its perfect summer life at last!. From Wordnik.com. [Walden] Reference
If we choose, we may study the alburnum only. From Wordnik.com. [A Week on the Concord and Merrimack Rivers] Reference
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