ME. C. V. WALKEE ON MiAGNETIC CALM;S AND EAETH-CUEEENTS. 
211 
of value iu the different sections of the drift itself. I have taken at random, from the 
October observations, a few cases for illustration : — 
13 u . 
38 u 
14 w . 
. . . 28 m 
. . . 31 u 
15 u . 
1—1 
?’9 
. . . 16 m 
. . . 20 m 
■?? 
. . . 30 M 
. . 35 M 
16 u . 
. . 14m 
• 9 ? 
. . . 38 m 
llu . 
. . .'20m 
18 w . 
... 21m 
99 
. . . 25 
The first column are Dover-London currents ; the second, D over-Tonbridge. Being 
read off on the same instrument, and under circumstances so favourable, they are strictly 
comparable. There are no relative values to be traced. For instance, 13° corresponds 
with 38°; 18° with 21° and 25°; 15° is coupled with various values — 15°, 16°, 20°, 30°, 
and 35°, and so on. These illustrations may be extended at pleasure. 
Since my original communication to the Boyal Society, an “ eighth article,” by Pro- 
fessor Loomis, has appeared in the ‘American Journal,’ voh xxxii., November 1861. On 
discussing the results accumulated in America, he infers that all the facts are consistent 
with the supposition of electric currents moving to and fro on the earth’s surface, the 
average direction of which, on that continent, is from about N. 45° E. to S. 45° W., a 
result remarkably in accordance with the conclusions to which we have arrived by a 
somewhat different process for the S.E. part of England. He has also discussed, in quite 
another way, the magnetic disturbances in Europe ; and he obtains a direction for the 
electric wave, connected with those disturbances, from N. 28° E. to S. 28° W. over the 
surface of Europe. These approximations are noteworthy. 
It is plain, however, from Tables XIII. and XV., that currents from time to time 
flow from some point in the S.E. and in the N.W. quadrants. These directions may for 
the present be called abnormal. In the existing state of our knowledge, it is impossible 
to say whether they indicate the state of transition between the two normal quadrants. 
The cases are few in number. In October, 26 were recorded ; in November, 16 ; or 
of the whole number. In December also I noticed a few. Like the normal, they are 
subdivided into two classes: u, u, u, 11; d, d, d, 31. The current was constant in the 
d, d, d direction, with a single interruption, from midnight October 28 to 1.50 a.m. 
October 29. Currents of this kind, as may be seen in Table XIII., are as definitely 
2 E 2 
