Cedar-wood, however, is said to be injurious to natural history objects, and to instruments placed in cabinets made of it, as the resinous matter of the wood becomes deposited upon them.
Exports consist chiefly of timber, mine-props, minerals, wine, salt and resinous products.
Podophyllin is a resinous powder obtained by precipitating an alcoholic tincture of the rhizome by means of water acidulated with hydrochloric acid.
This resinous exudation (Kino) somewhat resembles gum, hence the name " gum " tree.
Amber is not homogeneous in composition, but consists of several resinous bodies more or less soluble in alcohol, ether and chloroform, associated with an insoluble bituminous substance.
Crystals of sulphur are transparent or translucent and highly refractive with strong birefringence; they have a resinous or slightly adamantine lustre, and present the characteristic sulphur-yellow colour.
Where not exposed to the weather the wood is probably as lasting as that of the pine, but, not being so resinous, appears less adapted for out-door uses.
In times of scarcity the Norse peasant-farmer uses the sweetish inner bark, beaten in a mortar and ground in his primitive mill with oats or barley, to eke out a scanty supply of meal, the mixture yielding a tolerably palatable though somewhat resinous substitute for his ordinary flad-brod.
The resinous products of the tree are of no great value.
The bark contains a large amount of a fine, highly-resinous turpentine, which collects in tumours on the trunk during the heat of summer.
In the Alps and Vosges this resinous semi-fluid is collected by climbing the trees and pressing out the contents of the natural receptacles of the bark into horn or tin vessels held beneath them.
With their resinous to adamantine lustre and their translucency they also present somewhat the appearance of horn; hence the name hornsilver.
There are several species of palms, flowering trees, trees with beautifully coloured foliage, tree ferns, resinous trees and trees bearing tropical fruits.
In other districts lack of water impedes cultivation, though after the rains pasturage is abundant, and resinous plants are so varied and numerous as to justify the ancient name of the region.
Their lustre is vitreous except when they contain many minute crystals; they are then velvety or even resinous in appearance.
Of considerable importance to the value of the rubber is the absence of the resinous constituents which are present in greater or smaller proportion in all latices.
It has a strong and characteristic odour, and a hot sweetish taste, is soluble in ten parts of water, and in all proportions in alcohol, and dissolves bromine, iodine, and, in small quantities, sulphur and phosphorus, also the volatile oils, most fatty and resinous substances, guncotton, caoutchouc and certain of the vegetable alkaloids.
It may here be remarked that the name "European frankincense" is applied to Pinus Taeda, and to the resinous exudation ("Burgundy pitch") of the Norwegian spruce firs (Abies excelsa).
I i), the resinous exudation of Cistus creticus, C. ladaniferus and other species of "rock rose" or "rose of Sharon"; myrrh (Heb.
Olibanum of Java), corrupted in the parlance of Europe into benjamin and benzoin; camphor, produced by Cinnamomum Camphora, the "camphor laurel" of China and Japan, and by Dryobalanops aromatica, a native of the Indian Archipelago, and widely used as incense throughout the East, particularly in China; elemi, the resin of an unknown tree of the Philippine Islands, the elemi of old writers being the resin of Boswellia Frereana; gumdragon or dragon's blood, obtained from Calamus Draco, one of the ratan palms of the Indian Archipelago, Dracaena Draco, a liliaceous plant of the Canary Island, and Pterocarpus Draco, a leguminous tree of the island of Socotra; rose-malloes, a corruption of the Javanese rasamala, or liquid storax, the resinous exudation of Liquidambar Altingia, a native of the Indian Archipelago (an American Liquidambar also produces a rose-malloes-like exudation); star anise, the starlike fruit of the Illicum anisatum of Yunan and south-western China, burnt as incense in the temples of Japan; sweet flag, the root of Acorus Calamus, the bath of the Hindus, much used for incense in India.
In the " etching " process the surface of the glass is etched by the chemical action of hydrofluoric acid, the parts which are not to be attacked being covered with a resinous paint.
In Teneriffe and Grand Canary the corpse was simply wrapped up in goat and sheep skins, while in other islands a resinous substance was used to preserve the body, which was then placed in a cave difficult of access, or buried under a tumulus.
They are all trees, usually of large size, with alternate stalked, unequally pinnate leaves, and abounding in an aromatic resinous juice.
The leaves and husk of the fruit are resinous and astringent, and are sometimes used medicinally as well as for dyeing purposes.
Externally they are brown and marked with small transverse paler scars, and internally they present a dirty white resinous or starchy fracture.
It dissolves readily in ether, and has a soft resinous consistence.
The wood is close-grained, long-fibred, perfumed and highly resinous, and resists the action of water.
There are also two kinds of shrubby plants, a thorny Composita called " ccanlli " and another, called " tola," which is a resinous Baccharis and is used for fuel.
RETENE (methyl isopropyl phenanthrene), CisHis, a hydrocarbon present in the coal-tar fraction, boiling above 360° C.; it also occurs in the tars obtained by the distillation of resinous woods.
It contains about 20% of cinnamic acid in addition to 18 or even more of benzoic. (3) Palembang benzoin, an inferior variety, said to be obtained from Styrax benzoin in Sumatra, consists of greyish translucent resinous masses, containing small white opaque tears.
The transverse fracture has a resinous appearance with white streaks; the flavour is bitter and aromatic, and the odour characteristic. It consists of a mixture of resin, gum and essential oil, the resin being present to the extent of 25 to 40%, with 21to 8% of the oil, myrrhol, to which the odour is due.
The oils are usually contained in special cells, glands, cavities, or canals within the plants either as such or intermixed with resinous substances; in the latter case the mixtures form oleo-resins, balsams or resins according as the product is viscid, or solid and hard.
Since the methods of preparing the vegetable and animal fats are comparatively crude ones, they usually contain certain impurities of one kind or another, such as colouring and mucilaginous matter, remnants of vegetable and animal tissues, &c. For the most part these foreign substances can be removed by processes of refining, but even after this purification they still retain small quantities of foreign substances, such as traces of colouring matters, albuminoid and (or) resinous substances, and other foreign substances, which remain dissolved in the oils and fats, and can only be isolated after saponification of the fat.
The tree is a native of the islands and shores of the Mediterranean, passing eastward into Central Asia; but the resinous exudation found in commerce is collected in the island of Chios.
Chian turpentine is a tenacious semi-fluid transparent body, yellow to dull brown in colour, with an agreeable resinous odour and little taste.
ROSIN (a later variant of "resin," q.v.) or Colophony (Colophonia resina, resin from Colophon in Lydia), the resinous constituent of the oleo-resin exuded by various species of pine, known in commerce as crude turpentine.
Some oxidize rapidly on exposure to air, passing into resinous substances.
It melts at about 460° to a clear yellow liquid, which, on cooling, solidifies to a translucent resinous mass.
7rLru), a name given by the ancients to some of the resinous cone-bearing trees to which it is now applied, and, as limited by modern botanists, the designation of a large genus of true conifers, differing from the firs in their hard woody cone-scales being thickened at the apex, and in their slender needle - shaped leaves growing from a membranous sheath, either in pairs or from three to five together - each tuft representing an abortive branch, springing from the axil of a partially deciduous scale-leaf, the base of which remains closely adherent to the stem.
Their soft, straight-grained, resinous and often durable wood gives to many kinds a high economic value, and some are among the most esteemed of timber trees.
The tree is of quick growth and the wood strong and resinous, but it is less durable than Scotch fir, though much employed in ship-building; according to Emerson, trunks exist in Maine 4 ft.
The timber is valued in its native country, and is said to be durable and to stand exposure to the weather well; various resinous products are extracted from it.