162 REPORT—1846. 
Tasie XIV. (continued). 
Wave No. 5. 
Winds, 
Anterior. | Posterio: 
Directions and Localities, 
Slope. 
Noy. 12 | Ant. Trough. |Between Belfast and Shields......... 
13 Crest. S.W. of Cork, Plymouth and Paris... 
14 Crest. Belfast to London ......sessssseeseeees S.E. 
15 Crest. Passes the OrkneyS......+ecseceecseceee S.E. 
16 Crest. Between Orkneys and Christiania... Eg 
Wave No. 7. 
Noy. 17 Crest. Pasnes CMAs 203s 2ccercesscenspess cones 30°51 S.E. E> 
18 Crest. Between Cork and the Orkneys...... 
19 | Post. Trough. |Near Belfast and Shields ............. S.E. 
Wave No. 9. 
Nov. 19 | Ant. Trough. |Near Belfast and Shields ............ 
2 Crest. Passes the OrkneyS.......s0ee+.seee0++- 29°96 S.E. 
Wave No. 11. 
Noy. 21 Crest. Near Belfast and Shields ............ 29°95 | N.W. |S.E.E.> 
22 | Post. Trough. |Near Belfast and Shields ............ 
Wave No. 13. 
Noy. 23 Crest. S.W. of Christiania.....,...0-2...-0+0s- 29°62 
Post. Trough. |Cork to Bristol ............+6 “Prepeh f 
b Resultants of N.E. and S.E. currents. 
Part II].— Desiderata. 
In addition to briefly reviewing the progress made in this inquiry, it may — 
be well to glance at the desiderata that now present themselves to our notice. 
The object of this report, in connection with the preceding ones, has been to 
show that we have observed on some occasions the successive returns of ex- 
tensive barometric undulations, that these undulations have exhibited a certain 
physiognomy, and that we have been able to recognize and characterize them ; 
that when these undulations have been observed at various and distant 
stations, and the observations carefully reduced and compared, they have been 
resolved into separate and distinct waves of pressure, each having an advan- 
cing front, a crest extending in a certain direction, a receding posterior slope, 
and bounded by an anterior and a posterior trough. It is the object of the 
second part of this report particularly to show that these characteristic 
features of a wave are intimately connected with a certain arrangement of 
the aérial currents first suggested by Prof. Dove, consisting of horizontal 
and parallel beds of oppositely directed winds. In his letter to Col. Sabine, 
the Professor speaks of these currents as northerly and southerly, the mean 
direction being converted into south-westerly in the northern hemisphere by 
the rotation of the earth. The examination of Mr. Brown’s data has clearly 
developed a set of parallel and opposite currents at right angles to these, 
Hiatthiicrrintonscs 
—— 
