1864. | Mining, Mineralogy, and Metallurgy. _ 3839 
The wells of this district are chiefly in an area of about four square 
miles in the first three ranges of Enniskillen, When these wells have 
been opened, the petroleum has risen to the surface of the earth, con- 
stituting what are called “flowing wells.” One of these, which was 
sunk to a depth of about 200 feet, is said to have yielded, when first 
opened, not less than 2,000 barrels in twenty-four hours. The 
Enniskillen petroleum wells have produced as follows from the time 
of their opening :— 
Barrels. 
Previous to July 31, 1861 : : 5,529 
Half-year ending January 31, 1862 ; 6,246 
Do. do. July 31, 1862 E : 25,264 
Do. do. January 31, 1863 ‘ 57,550 
For the month of February 1863. C 8,874 
Number of barrels of 40 gallonseach . 103,463 
Giving a total yield of 4,138,520 gallons. 
Other districts are named from which petroleum can be obtained, 
although as yet the quantities in which it is likely to be produced are 
uncertain, as no sufficient exploration has been made. 
This Report, extending to 980 pages, is a valuable contribution to 
our scientifie lterature. 
M. Damour has communicated a paper to the Académie des Sciences 
on the ‘“‘ Density of Zircons.” He has given a long list of these pre- 
cious stones which he has examined. We select the results obtained 
in a few instances only, as showing the variation of density to which 
they are subject :— 
The Zircon of Ceylon—green colour . 4°043 
Do. — of India—blue tint : : 4°596 
Do. of Brevig—brown . : : 4-613 
Do. ofthe Ural—yellow brown . 4-669 
The indices of refraction are shown to vary in these minerals with 
their density.* 
A meteorolite found near Louvain, in Belgium, has been examined 
by M. Pisani, and found to contain— 
Nickelliferous iron, with tin and traces of phosphorus 8°67 
Pyrites . ; 4 ‘ ‘ ; : A 6°06 
Chromate of iron . : ‘ : 5 ; 0°71 
Silicates : : : ‘ ; ; ‘ suis 
99°72 
A full account of this stone was communicated to the Académie Royale 
de Belgique, and will be found in their Transactions. The Académie 
des Sciences of Vienna has also been occupied with the consideration of 
meteoric masses. M. Haidinger described the occurrence of meteoric 
iron found at Tucson, in the territory of Avezana, United States; and 
read a communication on a meteorolite observed at Vienna on the 10th 
* ¢T Institut : Journal Universel des Sciences,’ January 20, 1864. 
