96 REPORT—1843. 
(B.) In order to examine more particularly the nature of the increase of 
oscillation, it will probably be requisite to obtain stations in other parts of 
this area should future observations be undertaken. 
(B.) With respect to the increase of oscillation, the following questions 
have suggested themselves :—Do the oscillations increase from a single point 
of least oscillation? or do they decrease from a single point of greatest oscil- 
lation? The observations appear to indicate that they decrease from a single 
point of greatest oscillation, particularly those of June 1837. On this occa- 
sion the changes of the wind indicated the passage of a body of air in a state 
of rotatory motion, although it appears difficult to suppose that this body 
was of a cylindrical form, as the greatest depression of the barometer at each 
of the stations occurred with a north-west wind, consequently the centre of 
rotation must have been north-east of the station at the time: perhaps some 
other form, a body the horizontal section of which is an ellipse, for instance, 
may explain this. Upon the whole, the small number of stations over so large 
an area, and these occurring on two lines only, is a matter of much regret, as 
we can only at present obtain a glance at the affections of the atmosphere 
over this vast space. Probably if the stations were more numerous, the cha- 
racter of the decrease of oscillation from a point of greatest oscillation would 
be distinctly marked. 
June 1838.—Quebec, Burlington, Gardiner, Boston ;—Western Reserve 
College. 
(H.) The first four stations in their order form a group in which the pro- 
gressive modifications of a fluctuation of considerable extent may be clearly 
traced. It is best developed at Quebec (where fortunately the observations 
of this term are for the most part hourly, or at furthest two-hourly), and con- 
sists of a complete wave, with its lowest depression and culmination fully in 
view, and both very decided and regularly formed, the epochs being as 
below :-— 
Lowest depression .. 5 p.M., 21st M.T., at Station. 
Culmination $2 22279 AM. e22ndlss, sje 
Amplitude ........ 0°355 in. 
At Burlington the wave is flatter, and somewhat less regular. Epochs and 
amplitude as below :— 
Lowest depression............ 7 P.M., 21st. 
Culmination ............ ...- O Noon, 22nd. 
Amplitude of oscillation ...... 0°219 in. 
At Gardiner the wave is still more flattened, and the culmination protracted 
and rendered indistinct, so as to make it doubtful whether it falls fairly within 
the series, or whether another rise commences :— 
Lowest depression ...... 7 P.M., 21st. 
Culiminationy ccicees en. 2 sy: 22nd- 
Amplitude ...... eas oa OE Ee 
Lastly, at Boston the wave is wholly obliterated, and we have a gently-de- 
scending curve undulated only by the regular diurnal oscillations. 
The curve of Western Reserve College offers a level, unbroken except by 
the regular maxima and minima, which are however far from conspicuous in 
their development. 
Sept. 1838.—Gardiner, Flushing, Western Reserve College. . 
(H.) Western Reserve College, on the moderately descending slope of its 

