76 REPORT—1843. 
whole curve is remarkable for its smoothness. The range in 22 hours from 
the projected minimum is 0°733 inch. 
At Turin and Parma the absolute minimum of the preceding wave is fairly 
brought into view. In the former it occurs at 1" 42™, in the latter at 12 0™. 
In both series the upward slope of the wave is broken by many subordinate 
fluctuations. Of these, one is evidently correspondent in the two series. It 
occupies at Turin the interval from 13" 46™ to 17" 46™, and at Parma from 
15" 36™ to 18" 36™, forming an obtuse bulge on the slope of the curves, with 
a very remarkable shoulder at the end, or at the later of the two hours above 
indicated in each. After this each curve continues to ascend, and at 9546™ 
at Turin and 10° 36™ at Parma, attains a maximum which I consider as iden- 
tical with that noticed at Geneva as extending from 9 hours to 13 hours, 
and of which the corresponding epochs, determined by comparing the middle 
points of each, may be stated at 11 hours and 23 hours respectively for Ge- 
neva and Parma. The Turin series unfortunately breaks off at 10" 46™, so 
that a perfect identification of this feature for that station is prevented, but 
the general parallelism of the two curves for Turin and Parma leaves no 
room to doubt it. The Parma series continues till 6 p.m. on the 22nd, and 
continues to rise to the end, 2. e. till 5" 46™ m.r. at Brussels, at which epoch, 
however, the rise is so small that the true culmination may be considered as 
nearly attained, and would probably have been actually observed had the 
observations been continued another hour or two. Assuming this, and that 
the epoch of culmination for Parma was 31 hours, we have the following 
corresponding epochs :— 

SREMEV A oh oh esti tiga ste 115+ | 20 59 | 
Kremsmunster .. 0s... ... fc0-|.-+2 00s 21 25 
Tah. oo, saa 175 46™| 22 + 
Lg tar Rear g Bgeh 18 36 | 23 a og 

which give 1 hour for the time of the wave passing from Turin to Parma, 
and 10 hours from Geneva to Parma, while Kremsmunster is somewhat less 
than half an hour later than Geneva. 
If we compare the culminations only, or what we must suppose to have 
been the culminations, at all the stations, we have as follows :— 

1st culm. 2nd culm. Absolute culm. 
Markree ..| Doubtful. | + O08 50™ || Brussels........| +135 Om™ 
Edinburgh..| —1" 30™ | + 4 30 || Geneva........| +20 52 
Halifax ....| +5 24 | + 8 24 Kremsminster ..| +21 25 
Oxford ....|} +5 20 | + 9 50 | Parma ........ +31 + 
London....| +6 18 +10 i8 
Greenwich..| +7 18 +10 18 

Assuming the first culmination to have been the true one, and that in the 
progress of the wave they either run together or the second thins off and is 
lost, we have 32" 30™ for the time occupied in traversing the interval from 
Edinburgh to Parma, which in a direct line being about 950 miles, would 
give a mean velocity of 28 miles per hour, supposing the front of the wave 
to have been at right angles to this direction. But if we compare the inter- 
vals with the distances, we shall find this supposition to be inadmissible, for 
we find the progress of the wave to have been as follows :— 

