94 REPORT—1843. 
curves, the diurnal oscillations (and especially the maximum of the forenoon 
of the 22nd) are strongly indented on the upward slope. 
(H.) The curve for Gardiner is peculiar, and indicates some local disturb- 
ance. In place of the minimum with which the others commence being of a 
concave or basin-shaped form, this is deeply cuspidated, being formed by a 
bold convex sweep, plunging down to an abrupt point at 5 hours mean time, 
whence it immediately rises and slopes up in three distinct stages to the end. 
The St. Blas curve has no resemblance to any of the rest, but offers a fine 
specimen of diurnal oscillation boldly developed, 
(B,) The curves on this sheet exhibit a greater extent of area over which 
similar affections of the atmosphere were observed than any of the others. 
From Western Reserve College (31™ west of Albany) to Boston (11™ east of 
the same station), a group of similar curves is apparent; the depressions oc- 
curring about 3 p.M., and the apices about 10 a.m.: 42™ of longitude appear 
to be the extent of this group. 
(B.) The ranges of the barometer from New York to Boston are nearly 
similar (rejecting the 5 p.m. obseryation at Middletown, which appears to be 
in error), For twenty-seven observations, Boston, the easternmost station, 
exhibits the greatest range. For thirty-seven observations, Flushing exhibits 
the greatest, the difference between this station and Boston being ‘022, 
(B.) The curve at Gardiner, Maine, while exhibiting to a certain extent 
similar features to the curves westward, does not belong exclusively to the 
system. The range for twenty-seven observations is rather more than that 
at Boston, but considerably less for thirty-seven. The anterior portion of 
the curve as far as 5 p.m. is decidedly different from the preceding curves, 
and the continuous portion of it after | p.m, also differs very materially. 
(B.) The curve at St. Louis, while it generally agrees with the curves of 
the Maine group during the hours projected on the sheet, differs from them 
during the afternoon hours of the 22nd, being somewhat similar to Gardiner, 
Maine. 
March 1838.—Western Reserve College, Cincinnati, St. Louis, Montreal, 
Burlington, New York, Flushing, Newhaven, Middletown, Boston, Gardiner ; 
— Realejo. . 
(H.) The Realejo curve is disconnected with the rest and incomplete; the 
obseryations breaking off before the conclusion of the terms. Its general 
form is a flat concavity, with its minimum at 5 p.m., Mar. 21. 
The rest of the stations may be classed as follows ;— 
A. B Cc 
Gardiner. Burlington. St. Louis. 
Boston. Moutreal. Cincinnati. 
Middletown. Western Reserve College. 
New Haven. 
Flushing. 
New York. 
Group A. consists of eastern stations. Its curves rise steadily from the 
first commencement of the observations at daybreak of the-21st to a sub-cul- 
mination at about 1 a.m. of the 22nd (13 hours, 21st), whence they slightly 
dip to the morning minimum about 15 hours or 16 hours, and rising again, 
attain their absolute culmination at or about the regular epoch ofthe forenoon 
maximum, viz, 22 hours (10 a.m., Mar. 22nd). They all run closely parallel 
with exception of Boston and Gardiner, which manifest some irregularities 
and abruptnesses, 


