194 W. P. Blake on the Mineralogical curiosities 
compared to 3720 D; two circumstances which almost ifvari- 
ably occur. 
The formula for @ gives the delivery at the point of distribu- 
tion before the branch is inserted; we shall therefore have 
Q—Q= the loss sustained by the insertion of the branch; and 
g+Q—Q= the increase of discharge from the reservoir arising 
from the same cause. : 
Department of Public Works, Ottawa, Nov. 14th, 1867. 
L 
Arr, XXII.—Notes upon some of the Mineralogical Curiosi- 
ties of the Paris Exposition of 1867; by Wittram P. BuaKE. 
Tux display of minerals in the department of Mining and 
Metallurgy, Class 40, of the exhibition was very extensive, and 
although composed chiefly of ores and metallurgical specimens, 
there were many objects of particular interest mineralogically, 
either for their rarity, their great size or beauty, or as coming 
from new localities. There was also a large display of precious 
stones, cut and polished, and of ornamental stones, bot 
_ wrought and unwrought, such as columns, slabs, and vases of 
lished granite, porphyry, marble, and serpentine, or smaller 
objects of art in jasper, onyx, malachite, and lapis lazuli. 
n these last mentioned objects the Russian collection was 
particularly rich. One of the most conspicuous was an ellip- 
tical vase about six feet high, sculptured at the Imperial 
establishment of Ekaterinburg out of a compact gray Jjas- 
per from Kalkhansk. The shaft supporting the basin was or- 
namented by an entwined vine-branch with leaves and fruit 
exquisitely chiseled in high telief and polished. Two mag- 
nificent candelabra with pedestals of rhodonite were shown 
m the same establishment. These pedestals were about ten 
. feet high, and nearly two feet broad at the base, but were prob- 
ably formed of several pieces united. The rhodonite appears 
to occur in large homogeneous masses, and to be extensively 
employed for ornamental purposes. It takes a high polish, @ 
has a pleasing rose-red color, slightly mottled with black. 
Ivan Stebakoff, of Ekaterinburg, exhibited a great variety © 
of beautiful paper-weights, made of polished slabs of jasper, 
malachite, and lapis lazuli, surmounted by groups of flowers 
or fruits in their natural colors, cut out of various highly colored 
ornamental and precious stones. The government establish- 
ment at Tiflis, Caucasus, sent numerous ornamental objects, 
some fashioned out of a kind of marble-onyx similar to the beau- 
tiful stalagmitic marbles of Algeria and Mexico, and others out 
of a peculiar chatoyant obsidian. 
” 
