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Leaves are porous, and admit air and light more or less freely into their substance; they are generally smooth and even glazed on one surface; they are usually covered on one or both sides with spicula, and they very commonly present one or more acuminated points in their outline all circumstances which tend to augment their power of emitting heat by reflection or radiation.
And yet Thoreau camps down by Walden Pond and shows us that absolutely nothing in Nature has ever yet been described, not a bird nor a berry of the woods, nor a drop of water, nor a spicula of ice, nor summer, nor winter, nor sun, nor star. Indeed, no person can portray Nature from any slight or transient acquaintance.
Professor R. Jones, however, considers that this opinion should be received with considerable limitations. The last fact, trivial as it appears, assumes immense importance when we learn that to these spicula we must turn for an explanation of the isolated masses of flint which abound in various chalk formations.
In short, all the graces which young ladies and young gentlemen too learn from others, and the many improvements which, by the help of a looking-glass, they add of their own, are in reality those very spicula et faces amoris so often mentioned by Ovid; or, as they are sometimes called in our own language, the whole artillery of love.
The calcareous matter beneath the lava, and especially that forming the crystalline spicula between the interstices of the scoriae, although heated in an atmosphere probably composed chiefly of steam, could not have been subjected to the effects of a passing stream; and hence it is, perhaps, that they have retained their carbonic acid, under a small amount of pressure.
In walking, they had come near him, and while they waited he stood for a minute, gazing back down the path with boding and pathetic eyes; then he disappeared. She looked at Cromwell and thanked him for the warning, 'quia spicula praevisa minus laedunt. 'I would have you read it: gaudia plus laetificant, he answered gravely.
Imbedded in the chalky mud of the deep sea, in many localities, are innumerable cup- shaped sponges, provided with six-rayed silicious spicula, so disposed that the wall of the cup is formed of a lacework of flinty thread. Not less abundant, in some parts of the chalk formation, are the fossils known as Ventriculites, well described by Dr.
These particles, or spicula, as they are termed, are so uniform in the species to which they severally belong, that, in the words of Professor Grant, if the soft portion be destroyed, and a "few of them brought from any pan of the world on the point of a needle, they would enable the zoologist to identify the species to which they originally belonged."
Here is a large flask containing a freezing mixture, which has so chilled the flask, that the aqueous vapour of the air of this room has been condensed and frozen upon it to a white fur. Introducing the alum-cell, and placing the coating of hoar-frost at the intensely luminous focus of the electric lamp, not a spicula of the dazzling frost is melted.
Croton oil dropped on the tongue will also be of great benefit: if there should be effusion or compression from fracture of the bones of the cranium, nothing but trephining will be of any service, as we can hardly hope for the absorption of the matter, and the removal of the spicula of bone can alone afford relief to the patient.
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