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Sentences for "carbonaceous "
, the fleshy Ascomycetes, or, as they have been termed, the Discomycetes, and the hard, or carbonaceous Ascomycetes, sometimes called the Pyrenomycetes.
The walls of the perithecia, rather more carbonaceous than membranaceous, are reticulated, reminding one of the conceptacles of Erysiphe, to which the perithecia bear considerable resemblance.
Perithecia carbonaceous or membranaceous, sometimes confluent with the stroma, pierced at the apex, and mostly papillate; hymenium diffluent.
It is of comparatively little importance in itself, and is really produced by the oxidation of part of the carbonaceous matters of the plant; but it has a special interest, in so far as it shows that part of the bases contained in the plant must in its natural state have been in[Pg 80] union with organic acids, or combined in some way with the organic constituents of the plant.
It must be added also, that many of them contain carbonaceous matters produced by the decomposition of early races of plants and animals, and that mixtures of two or more of the different classes are frequent.
Several different substances, but more especially farm-yard manure, fulfil in a very remarkable manner the conditions of a general manure, and supply abundantly, not merely the mineral, but also the carbonaceous and nitrogenous matters necessary for building up the organic part of the plant; and hence its use is governed by principles of comparative simplicity, and really resolves itself into determining the best mode of managing it so as effectually to[Pg 156] preserve its useful constituents, and, at the same time, to bring them into those forms of combination in which they are most available to the plant.
The diversity of colour depends upon the bleaching power of the oxygen, which, in temperate climates, combines more completely with the carbonaceous matter deposited in the rete mucosum; while, in ho ... and light, and has less tendency to unite with the carbonaceous matter.
We obtain from an equal surface of forest, or meadow-land, where the necessary mineral elements of the soil are present in a suitable state, and to which no carbonaceous matter whatever is furnished in manures, an amount of carbon, in the shape of wood and hay, quite equal, and oftimes more than is produced by our fields, in grain, roots, and straw, upon which abundance of manure has been heaped.
The produce of carbon on a meadow, or an equal surface of forest land, is independent of a supply of carbonaceous manure, but it depends upon the presence of certain elements of the soil which in themselves contain no carbon, together with the existence of conditions under which their assimilation by plants can be effected.
If we add the carbon and nitrogen of the leaves of the beetroot, and the stalk and leaves of the potatoes, which have not been taken into account, it still remains evident that the cultivated fields, notwithstanding the supply of carbonaceous and nitrogenised manures, produced no more carbon and nitrogen than an equal surface of meadow-land supplied only with mineral elements.
Aqueous and igneous rocks-General characters of the sedimentary rocks-Mode or formation of the sedimentary rocks-Definition of the term "formation"-Chief divisions of the aqueous rocks-Mechanically-formed rocks, their characters and mode of origin-Chemically and organically formed rocks-Calcareous rocks-Chalk, its microscopic structure and mode of formation-Limestone, varieties, structure, and origin-Phosphate of lime-Concretions-Sulphate of lime-Silica and siliceous deposits of various kinds-Greensands-Red clays-Carbon and carbonaceous deposits.
) instead of being composed of the original carbonaceous matter of the wood, is now converted into flint.
Black marbles owe their colour to the presence of very minute particles of carbonaceous matter, in some cases at any rate, and they may either be metamorphic, or they may be charged with minute fossils such as Foraminifera (e.
In the great majority of cases where rocks are found to contain carbon or carbonaceous matter, it can be stated with certainty that this substance is of organic origin, though it is not necessarily derived from vegetables.
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