ry _ LLC LA LO IT - 
Physics and Chemistry. 7 121 
SCIENTIFIC INTELLIGENCE. 
I, PHYSICS AND CHEMISTRY. 
Puysics, 
ho Laplace’s inference of 600 meters (near 2000 feet) for the mean 
epth of the ocean. All researches tend to show that this depth is 
in the path of the Simoda waves to San Diego and San Francisco (34° 
40", 82° 42’, 37° 48’) a depth of 2,280 to 2,100 fathoms (13,380 to 
12,600 feet). 
Young estimates the average depth of the Atlantic at about 15,000 feet, 
and of the Pacific about 20,000 feet. 
uyott derives from the law of the relief of continents about 15,000 
feet for the South Atlantic, which he suggests may be too little. — 
Herschelt derives from the velocity of the tide wave, accordi 
Airy’s table, 22,000 feet for the Atlantic basin from lat. 50° S. to lat. 
50°N. He thinks that an average depth of four miles is rather above 
than below the true depth. 
about sons, assumes a probable average of three and a half miles or 
900 feet. Bs 
c There is certainly a wide difference of statement among these authori- 
pe: ut We seem authorized in assuming a mean depth for the great 
Sceanic basins of 15,000 to 18,000 feet. The greater of these numbers 
Would still leave Mr. Semann’s conclusions on the absorbability of the 
waters of the globe by its rocky mass quite within the range of probability. 
Crmasrry. ‘ 
2. On some of the double salts of Cyanid of Mercury: Preliminary 
wlice of a Memoir upon this subject; by W. P. Dexter. (From the 
Proceedings of the American Academy, Dec. 10, 1861.)—An investiga- 
on of some of the compounds of cyanid of har 
. 
* : 
; Coast Su for 1855, p. 342. 
Gayot, Herth ePaper 1855: P 
Herschel, Physical Geography, p. 72, English edition. 
Kléden, Phys. Geog. (Erdkunde.) ; 
At Jour, Scr—Sucoxp Sunies, Vot. XXXIII, No. 97.—Jax., 1862. 
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