Miscellaneous Intelligence. 159 
IV. MISCELLANEOUS SCIENTIFIC INTELLIGENCE. 
1. On Oceanic Circulation ; by Wu. B. CarpextEr.—The very 
decided expression of opinion on the part of Professor Wyville 
Thomson, to which currency is given in the Athenwum, against 
the doctrine of “a general vertical circulation of the water of the 
ocean, depending on differences of specific gravity,” is far from 
being decisive of the question; and might, perhaps, have been 
advantageously withheld, until my friend should have learned, on 
is return home, what progress has been made towards its solution 
by ee inquiry, during his three and a half years’ absence. 
If he had b 
(74 : 
gradient.” And e might have further received from Mr. Froude 
ie point furnished by his extended observations on harbors, lochs, 
io fiords; to the effect that wherever the specific gravity of the 
Surlace-water of any such inlet of the sea is reduced by a river 
: orway, there is a deep channel, along 
the Cattegat Thi cial water can be traced southward as far as 
f 
_. Pressure over the northern end of the trough, constant! 
mal : gh, co y 
sree y the reduction of downward pressure over its sou 
ity, which results from the admixture of fresh water. 
