Se ee Ue ae en ne a ee eee 
Miscellaneous Intelligence. 509 
the Geological Survey, but from the railway authorities, who 
franked us across the continent, and on all the branch lines which 
we traverse 
e Earths of the Cerium Groups as found in the North 
Barolinn Samarskite.—In my original paper and subsequent note 
on this group of a as separated by sulphate of potash from 
the mixed earths of North Carolina ee I then stated that 
oxide of cerium was not to be ranked among them. have con- 
tinued the researches in this direction, asd while they are far from 
being complete, it is pretty well determined that the bulk of the 
earth separated by the sulphate of potash is a new earth, if it be 
The other oxides of this group are thoria and ox um, 
Tam still prosecuting a researches, and hope before ps ps give 
more oth ae — awrence "Smith's letter 4 
abstract of aper ae Henry L. Axssort, Major of Rogites ers, 
Bvt. Brig. ence read before the National Academ my of Sciences 
at its recent meeting in New York.—Mr. Mallet’s results, reported 
many years ago to the Royal Society, were: 
Velocity i in ft. per second i - Mase Se eee 825 ft. 
n discontinuous — much shattered granite,, 1306 ft. 
ts “ ee in more so lid gran 1665 - 
a = “in quarries at Holyhead (MOAN) 5 a 1320 ft. 
The Pe ger obtained by the officers of the United States Engin- 
eer School of Application at Willet’s Point, for the rate through 
drift deeteation of Long Island, are the followin ng: 
TABLE I. 
2 . 
& &  |&,,| Tremor of Ss 
Be 2 = a3 mercury. BS 
y=] Date. Observer. | Cause of Shock.| 23 |35 38 
Qa o 
: a | d) Lasted 
g A & apie for a = 
miles.| | sec'ds. 'sec’ds ft. pr sec. 
1| Aug. 18, "76./Capt. L 200 Ibs. dynm.| 5 + |B| 5 5280 + 
2 Sept. 24, 16.\Lieut. Young /|Hallet’s Pt. ex.) 5134) A.) 7+} 634) 3873+ 
3 “ |Lieut. Griffin is «1. 1. $330) B.|. .5°3.) T2°3.) 8300 
et “'Lieut. Kingman} “  “ “| 9333) A.| 10°9 | 23°5| 4521 
1. * \Lieut. Leach . 12°769| B.| 12°7 | 19:0} 5309 
6/Oct. 10, '76./Lieut. Kin; an be Ibs. powder.| 1°360} A.| 5°8 | inst’t} 1240 
gm. po 
7\Sept. 6, 77.|Lieut. Kingman 0 Ibs. dynm.} 17169} A.| 1°8 | 7:8} 3428 
8} “ “© Lieut. Leach “ | 1169) B.| O'7 | 17-8} 8814 
9\Sept. 12, '77.| Lieut. Griffin 306 i dynm.| 1°340) A.| 1:05) 88| 6730 
10) “ “ * ILieut, Leach ye ng 1340} B.| 0°81} 17-1} 8730 
ll} “ \Lient. Griffin (70 Ibs. powder.| 1-340) A.| 1°27) 4°8| 5559 
I) eo eo: h ee es 13401 B.| 0°84! 15-11 8415 
In the case of No. 6 the charge was five feet below the surface. 
In those of Nos. 11 and 12 the charge was thirty feet below sur- 
