118 . Scientific Intelligence. 
Barometer. Boiling Point, Difference from Difference from Regu 
Inches, Fahr. my formula, formula, 
20°77 194-28 + 0:22 + 0:32 
20-79 19434 — 0:08 +001 
22°40 197-94 — 0°04 +0:12 
22°67 198-51 — 008 + 0 06 
23°15 199-52 — 0:07 + 0:06 
23°35 199-94 + 0-01 + 0:15 
23°89 20104 —Ol1l1 + 0:03 
23°99 201-24 — 0-09 -+ 0.08 i 
24:02 201°31 + 0:04 — 0:20 
24°105 201-47 — 0:17 + 0.03 
25°14 203°51 + 0:04 + 0:19 
ee 28 "4.9 209°54 — 0-0 — 0.0 
The oo with M. Regnault’s table is also extremely close; 
and considering the ordinary limits of error of such observations, the — 
writer considers it nearly indifferent for elevations under 13,000 f fe 
which method of Iculation be use 
j th 
sspects from that commonly use a ane the 
) eters were satisfactor 
n carefully examining r. J ph Hooker's detailed results, (obli- : 
gingly communicated by him,)- hich that naturalist considered to 
incompatible with Professor Forbes’s formula, it is shewn that the incon: _ 
sistencies of observations are so considerables” alijeda. diel to 
a decided preference to one formula rather than another, for the pur- 
of representing them; but that up to heights of at least 13,0( 
servations as well as any other; and the rate of diminution is almost 
the same as that deduced from bint Forbes’s observations, ora low- 
ering of 1° for 538 feet of ascent. pee 
The author has little doubt ie M. Regnault’s table, (which was not — 
published when he last wrote,) does really represent the law according : 
to which water boils more accurately than the simpler linear formula, 
though the difference is in most cases insensible. For all ordinary 
heights (or up to 12,000 feet) igre s =i — be more accurately 
represented by the formula, =~ 
wher 
h—517 T-+-T?. 
Il. Mineratocy anp Gerozoey. 
“h Herrerite identical with Smithsonite ; ; by Dr. F. A. Genta, 
(Proce roc. Acad. Nat. Sci., vii, 232.)—Wh en Herrera described an apple- 
