Art-studies from nature, as applied to design : for the use of architects, designers, and manufacturers . unded, and, as it seemed, onthe verge of dissolution. The entire figure had the appearance oftwo distinct orders of formation—the prisms which belong to avery low temperature, and the spiculae which are commonlyformed at and about the freezing-point. Fig. 37 is another ofthe same class, and in a very intermediate state; the additions tothe main radii are neither prisms nor spiculae, yet partaking ofthe character of both : its peculiarity consists in the tertiaryincrustations being placed d
Art-studies from nature, as applied to design : for the use of architects, designers, and manufacturers . unded, and, as it seemed, onthe verge of dissolution. The entire figure had the appearance oftwo distinct orders of formation—the prisms which belong to avery low temperature, and the spiculae which are commonlyformed at and about the freezing-point. Fig. 37 is another ofthe same class, and in a very intermediate state; the additions tothe main radii are neither prisms nor spiculae, yet partaking ofthe character of both : its peculiarity consists in the tertiaryincrustations being placed downwards towards the centre. Thisform has been observed only during very severe cold. Fig. 38 is somewhat analogous to the crystals of water; its CRVSTALS OF SNOW. 151 centre is hexagonal, but the prisms are irregular crystallineincrustations of the utmost delicacy and transparency; it was oflarge size, fully half an inch in diameter, and glistening like afragment of talc among the snow-flakes, was discernible at aconsiderable distance. Fig. 39 (page 156) is a specimen of a double crystal; that is,. Fig. 35-two similar crystals united by an axis at right angles to the planeof each. It is highly complex, and the effect of each is more thandoubled by the arrangement. Crystals so united are not unfre-quent in severe weather. During one winter our observations numbered nearly twohundred varieties. 52 ART-STUDIES FROM NATURE. The series of small drawings given on pages 137, 138, and139, were made with a lens of moderate power, but they arenot equal in value or structural detail to those drawn beneaththe microscope. They are among the most elementary figuresobserved; and, as illustrative of the first principles of forma-tion, are chiefly worthy of consideration. Of more elaborate
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