282 Miscellaneous Intelligence. 
100° of Centigrade ; but in France the height of the barometer for 
graduation is 760 millimeters, while in England it is 30 inches, equiva- 
lent to 761:9862 millimeters. The Centigrade scale corresponding to 
212° Fahrenheit is therefore 100-0727 degrees. 
To this — there is still another, (for instruments made at 
London and Paris,) amounting to y’yth of the preceding, which depends 
aris. 
Representing by G the force of gravity at Paris, and by g that at 
London, and deducing G and g from the observed length of the 
G 
25 nia we have, Log. — Peas 1:998797. We hence obtain 759: 7185 
‘. ~.., mnillimeters for the height of the barometer at zero in Pevissce The dif- 
pee " Sfenke nce is equal to 0°215 millimeters or 0:0079 de 
. These two corrections being applied, the Pusiciat “ical should stand 
at 100: 08066 degrees, when the London scale marks 212 degrees. The 
(F — 32°) x 100: 08066 
:: fortents then aaneies C= 
180 
The correction is small; but in exact observations, the thermometer 
is read to 0-08 degrees ; and it is Saairahin that even a slight error should 
; not be added to errors of observa 
4. 6. Discovery of an Infusorial "Sitetin in Florida; by Prof. J. ee 
Bauer, —While on a visit to Tampa (Fort Brooke), Florida, I noti 
on the shores of Hillsborough Bay, between the mouth o f Hillsborough 
River and Ballast Point, a white crumbling rock, which = its lightness, 
 friability and other characters, somewhat resembled the Infusorial Marls 
es of ‘Virginia. An examination made upon the spot with a common 
Co dington ‘lens enabled me to see small circular discs upon the freshly 
r Reiored surfaces, which subsequent examinations proved to. belong to 
oscin ate umerous other marine species of Navicula, 
ether with numerous spicules of ponges were 
va : it is pot improbable that he esos near Tampa may be a a porti 
rb of a deposit as a s those discovered by Prof. W. B. Rogers 
* et ies ame and Mar 
“6 te oaiatetick have. beeti made to apply electro- -magneti 
co rte ayy and: Spariculaaly described the a 
. , De Negros 
