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I would rather have him show me an acanthus than a finished drawing of the foliation of a capital. Yet I would not allow my pupil to have the enjoyment of this or any other exercise all to himself. By sharing it with him I will make him enjoy it still more. He shall have no competitor but myself; but I will be that competitor continually, and without risk of jealousy between us.
That, also, consists of rich and multitudinous bas-reliefs, enclosed in panel mouldings, with shafts of mosaic, and foliated arches sustaining the canopy. Do you think Orcagna, any more than Pisano, if his spirit could rise in the midst of us at this moment, would tell us that he had trusted his fame to the foliation, or had put his soul's pride into the panelling?
The fact often referred to in this chapter, of the foliation and the so- called strata in the metamorphic series, that is, the alternating masses of different varieties of gneiss, mica-schist, and hornblende-slate, etc., -being parallel to each other, at first appears quite opposed to the view, that the folia have no relation to the planes of original deposition.
Sunset, and the swift winter twilight, had tinted, then dimmed, the light in the room. On the oak-beamed ceiling, across the ivory rosettes, a single bar of red sunlight lay, broken by rafter and plaster foliation. She watched it turn to rose, to ashes. And, closing her eyes, she lay very still and motionless in the gray shadows closing over all.
The same pressure which has caused the rock to cleave has set free some of its mineral constituents along the cleavage planes to crystallize there as mica. FOLIATION. Under still stronger pressure the whole structure of the rock is altered.
The mere presence of true strata in the midst of a set of metamorphic schists, is no argument that the foliation is of sedimentary origin, without it be further shown in each case, that the folia not only strike, but dip throughout in parallel planes with those of the true stratification.
In the fourth bay the Decorated arch has been filled with Perpendicular tracery, but the fifth and sixth windows remain in their original beauty as on the north side, save that in the easternmost the small circles have been mutilated and have lost their foliation.
As, however, we shall not probably be led either to Bergamo or Bologna, I may mention here a curiously rich use of the dentil, entirely covering the foliation and tracery of a niche on the outside of the duomo of Bergamo; and a roll, entirely incrusted, as the handle of a mace often is with nails, with massy dogteeth or nail-heads, on the door of the Pepoli palace of Bologna.
For analogous cases in clay-slate, see Professor Henslow's Memoir in "Cambridge Philosophical Transactions" volume 1 page 379, and Macculloch's "Classification of Rocks" page 351. With respect to both foliation and cleavage becoming tortuous where quartz-veins abound, I have seen instances near Monte Video, at Concepcion, and in the Chonos Islands. See also Mr.
From these several facts, and more especially from the case of the clay-slate in Tierra del Fuego, it must, I think, be concluded, that the same power which has impressed on the slate its fissile structure or cleavage has tended to modify its mineralogical character in parallel planes. Let us now turn to the foliation of the metamorphic schists, a subject which has been much less attended to.
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