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Let ABH be a parallelepiped of crystal, and let the top surface AEHF be a perfect rhombus, the obtuse angles of which are equally divided by the straight line EF, and the acute angles by the straight line AH perpendicular to FE. The section which we have hitherto considered is that which passes through the lines EF, EB, and which at the same time cuts the plane AEHF at right angles.
The pieces of it which are found have the figure of an oblique parallelepiped; each of the six faces being a parallelogram; and it admits of being split in three directions parallel to two of these opposed faces. Even in such wise, if you will, that all the six faces are equal and similar rhombuses. The figure here added represents a piece of this Crystal.
This staircase filled up a kind of Chimney or Funnel, or rather Parallelepiped, in the house: half-way between each floor was a landing where it turned right round on itself, and on each floor a larger landing flanked by two doors on either side, which made four altogether.
These stones seem to bear some proportion to the thickness of the walls in which they are employed, being larger in the thicker walls; the greatest length of the parallelepiped appears to form the thickness of the thiner walls, while two or more are employed to form that of the thicker walls. I walked on shore this evening and examined these walls minutely and preserved a specimine of the stone.
These Stones Seam to bear Some proportion to the thickness of the walls in which they are employd, being larger in the thicker walls; the greatest length of the parallelepiped appear to form the thickness of the thiner walls, while two or more are employed to form that of the thicker walls.
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