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make them out with certainty. As if Nature intended 
to elude our utmost penetration and research; and 
to hint, that it would be in vain for us to attempt 
to follow her through all her changes, and dresses, 
which she is constantly putting on. 
We have the three and six-sided pyramid; the 
six-sided prism; the six-sided plate; which I so call 
for want of a more descriptive term, being the ends 
of the six-sided prism united, without the interme- 
diate column or shaft ; the dodecaedron, consisting of 
two six-sided pyramids united, whose bases alternately 
advance and recede in angular lines, and which has 
been denominated by Haiiy, Metastatique; the Dode- 
caedron, in which the bases of the pyramids are 
marked by one or two transverse lines of division ; 
the Lance and Mitre-shaped crystals, formed by the 
junction of very curious variations of the rhomb, 
and six-sided pyramids, and having a _ four-sided 
rhomboidal base, and a four-sided shaft, with a pro- 
portionably lengthened point. One of these, in my 
possession, measures in length an inch and half; and 
another, three inches, with a diameter of three- 
quarters of an inch. Many more might be added, 
