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there was an interference of general currents from somewhere 
about South-East and North- West, which, alternately exist- 
ing alone, or mutually more or less interfering, gave rise to 
various other directions, and to some of those periods of 
tranquillity, when beds, indicating very feeble currents, 
were deposited. 
I have applied a similar method of research to the coal 
field in the neighbourhood of Edinburgh. I had not time 
to trace the various beds on the surface, but measured the 
directions of the currents in the greater part of the accessible 
points within ten miles of that city, which are not very 
numerous, and in many quarries the stone is so regularly 
bedded that it could not be ascertained. It would be tedious 
to describe the facts seen in the various places, and I shall, 
therefore, give the resulting means in a tabular form : — 
Bed of the river, near Dean- 
bridge, N. 54° W. 
Craigleith Quarry, N. 37° E. 
Gilmerton Edge, N. 83° W. 
Dalkeith, by the bridge, N. 21° W. 
Dalkeith Quarries, a mile East, 
N. 3° E. 
Dalkeith bed of N. Esk, N. 3° E. 
Auchindinny Mill, S. 3° E. 
Granton, N. 8° W. 
Kirkaldy, N. 30° E. 
Beds along the coast) N. 7° E. 
from Kirkaldy tot S. 38° E. 
Kinghom ) N. 17° E- 
Drummore, N. 30° E. 
Tranent, N. 18° W. 
Inveresk, N. 78° E. 
Joppa, N. 27° E. 
Portobello, N. 39° E. 
Slateford, N. 2° E. 
Straiton, N. 28° W. 
Humbie, near Winchburgh, 
N. 37° E. 
Cramond, N. 67° E. 
Crichton, N. 21° W. 
Gorebridge, N. 41° W. 
Stobhill, N. 18° W. 
Arthur's Seat, N. 38° W. 
Boslin, N. 22° E. 
Bonnyrig, N. 33° W. 
Goukshill, N. 54° E. 
Newbattle, N. 67° E. 
Dalmahoy, S. 19° W. 
Taking the average of all these local means, the general 
direction is N. 4° E. 
Comparing them together,, it will be found that, not only 
