Mineralogy and Geology. 275 
parallel to it, or to any other occurring plane. Moreover the cleavage 
planes had no symmetrical arrangement with reference to the axes of 
symmetry in the crystal. . 
Aithough, therefore, the violet crystals are monometric fluor spar in 
cleavage and other characters, I am not satisfied that the external form 
is monometric in origin; it may be pseudomorphous after some spe- 
often uneven,) incline to one another, 113° 30’. I obtained also 12:12 
= 74° 30’, 1:13—= 150° 45’; it: (unlettered plane) 104° 30’; 2:2 
=131° in one crystal ; 1383°—134° in another; (and the latter crystal 
afforded also 2% : 2% = 118° 15'.) In one specimen there is a plane 
replacing the edge iz : 2i, giving for the inclination on 2¢ approximately 
149° 30’; it is probably the plane 6%, following the lettering in the 
figure. The plane 23 is usually uneven; and there is sometimes an- 
other between it and 27. : 
One of the Prosopite crystals is violet fluor at one extremity and 
white like a kaolin at the other. 
jole on Geology of country East of Cascade Monntains, Oregon, 
(extract of a letter from Geo. Gisps, Esq. dated Steilacoom, Washington 
Territory, May 7th, 1855).—Dr. George Suckley, Assistant Surgeon 
U.S. A., stationed at the Dalles of the Columbia, Oregon, has recently 
ds of basalt. The limestone appears to be protected in places by a 
layer of river stones and gravel, and elsewhere to be metamorphic. 
The order of position descending is as follows, Ist. Sand and superfi- 
cial soil 1 to 10 feet ; 2nd, basaltic rock 3 to 10: 3d, cobblestone and 
nic remains, in that region has been the subject of remark. This dis- 
covery will throw much light on the character of the interior sea which 
once occupied that basin sigue ee 
Statistics of Coal, including Mineral Bituminous Substances em- 
ployed in Arts and Manufactures ; with their Geographical, Geological 
and Commercial Distribution, and amount of Production and Consump- 
tion on the American Continent, with Incidental Statistics of the Iron 
Manufacture, by R. C. Tartor, F.G.S. on, etc., etc. 2nd edition. 
and Agric. in Delaware College, &c. 640 p 
and numerous wood-cuts. Philadelphia, 1845: J. W. Moore. 
first edition of this work was issued in 1848. Since that time the able 
