2 haem eae: a ae Se ran i i Sig = Sgr 
268 Scientific Intelligence. 
SCIENTIFIC INTELLIGENCE. 
I. PHYSICS AND CHEMISTRY. 
Puysics. 
‘i. peeeeeoiare-cf the Atlantic Ocean compared with that of the air 
S uthampton to thi In a letter from M. Anpres Posy to 
point of the United States to South America. It is also by the same 
method that Mr. C. Saint Claire Deville has pointed out the poles of heat 
and cold which eddy in the sea of the Antilles, where the curves are com 
ccabibally inflected.) At present I will simply call attention to the in- 
which shoals exert upon the thermic state of the ocean. 
apace were first observed in 1776 by Blagden,(2) confirmed in Sr ‘ 
han 2 imag and more recently by Hu mboldt,*) Jol 
Dav ©. Pave (6) and others. 
ression Z saor pales near the land reveals to the a 
a oa of a shoal, or the proximity of a coast which is yet seh she 
ble. Williams frequently observed a depression of temperature [0 * ' 
extent of 4° C. while he was at least three hours distant from any Ped 
of danger. The statement of Humboldt that “the proximity of a 
er is indicated by a rapid decrease of the temperature at the nine 
e sea” is not only interesting to the philosopher but important af 
the safety of navigation. The use of the thermometer should 0% 
course lead to the neglect of the lead, but many experiments ts show me 
variations of temperature, measured even by imperfect instruments, en “4 
warning of danger long before the vessel comes upon soundings. pe lsd | 
cases the cooling of the water may lead the pilot to heave the 
whee he would —— the most perfect security.(7) 
mS Recherches sur les paux phénoménes de Météorologie de oat 
ee ne i is, 1849, in 4to, p. 189-229. seston de la 
piper a ‘rance, 1853, t. 1, p. 160-165, avec une 
©) Volney: iebior ds Games du sol des Ktats-Un ie Pamivige Paris, 1808, 
mor: Memoire sur Temploie du Thermométre OR la Pa a gt Read i in 1790, 
“eal Seen geen hyo 4 of Philadelphia, and translate 
Madrid, 179 vO. be i 
x) Voyage aux regions é quinoziales. Paris, 1816, en 8vo, p. 100, 1294 
1) Bend bere the Royal Soety of rea aga ep siay 1 
aie de découvertes aux terres austr ag A at . 
Bi  oevpsrmtgkennbendgr ay aa 
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