160 REPORT—1 846. 
other at right angles, the individuals in both gradually decreasing in size. In 
the speculation which has been ventured relative to the S.W. system, the 
mass of terrestrial surface forming the N.W. boundary of the great eastern 
continent has been assumed as the rarefying surface, producing the set of 
parallel and oppositely directed S.E. and N.W. winds, the currents gradually 
shifting towards the N.E. The gradual contraction of the beds of each 
system as the observations proceed is a highly interesting feature, which re- 
quires a more extensive discussion for its elucidation. 
Tasie XI.—Exhibiting the principal lines of the greatest diminution of 
pressure of the N.W. system of waves, Nos. 2, 4, and 6. 
Epochs. Directions. Values. Slopes, 
Nov. 1 [Belfast to Paris ......... ‘29 Anterior, No. 2 
2 {Orkneys to Paris......... 37 2 
4 Orkneys to Paris......... 69 2 
5 {Belfast to Paris ......... 80 2 
6 |Belfast to Paris ......... 68 2 
7 |Belfast to Paris ......... “54 2 
9  |Paris to Orkneys......... 96 Posterior, No. 2 
10 |London to Cork ......... “44 2 
IL, AN Paris'to0\Cork ‘scceceessaes 34 2 
16 |Orkneys to Paris......... 72 Anterior, No. 4 
17 _—‘|Belfast to Paris ......... 52 4 
18 |London to Cork ......... 35 Posterior, No. 4 
18 {London to Orkneys...... 35 4 
20 |Orkneys to Paris......... “Al Anterior, No. 6 
21 ‘|Belfast to Paris ......... 38 6 
22 [Cork to Paris «........... “45 6 
24 _|Paris to Cork: s.....0s0s.< “48 Posterior, No. 6 
25 .|Paris to,Cork -ssvs-seneess “21 6 
26) "Paris to Cork s.,..cck-- es 13 6 
TasLe XIJ.—Exhibiting the principal lines of the greatest diminution of 
pressure of the S.W. system of waves, Nos. 1, 3, 5, 7, 9, 11, 13, 15. 
Epochs, Directions. Values. Slopes. 
Noy. 1 [Belfast to Christiania... "55 Anterior, No. 1 
3 |Christiania to Paris...... 58 Posterior, No. 1 
1l_‘|Christiania to Cork...... 57 3 
12 |Christiania to Shields... 13 3 
12 |Plymouth to Shields ... “39 Anterior, No. 5 
13 ‘|Paris to Christiania...... 59 5 
14‘ |Belfast to Christiania ... “56 5 
15 |Orkneys to Cork......... “64 Posterior, No. 5 
17 _—_‘|Belfast to Christiania ... 57 Anterior, No. 7 
18 |London to Christiania... 42 7 
21 ‘| Belfast to Christiania ... “41 Anterior, No. 11 
23 |Christiania to Cork...... 52 Posterior, No. 13 
24 Christiania to Cork...... 1:12 13 
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