78 LAMPLUGH : NOTES ON THE WHITE CHALK OF YORKSHIRE. 
north and south line the sum of downthrow on the western half will 
almost exactly balance the eastern, the figures being as follows : — 
Western half. 
Number of faults, 37. Amount of displacement, 32 feet 3^ inches. 
Eastern half. 
Number of faults, 33. Amount of displacement, 33 feet 5 inches. 
The closeness to coincidence of these figures is perhaps in part 
accidental. Indeed, an attempt which I have recently made to verify 
the figures has shown that this must in some degree be the case, 
since owing to new slips in some portions of the cliff, and the removal 
of the previously fallen material by the sea in other places, a list 
compiled now would be slightly dift'erent from that of four or five 
years ago. But that the general effect of the faults is to nullify 
each other, and not to accumulate the throw in one direction, has 
received full confirmation. 
It is noteworthy that only if divided in the north and south 
direction can the halves of the dial be made to balance, and that 
their inequality becomes the greater the farther this line is departed 
from. If, for instance, the division be made from west to east the 
following result is obtained : — 
Northern half. 
Number of faults, 23. Amount of displacement, 18 feet 9 inches. 
Southern half. 
Number of faults, 47. Amount of displacement, 46 feet 1 1^ inches. 
When the faults are recorded consecutively as they occur in the 
cliff, it will frequently be found that for a short space the majority 
present displacements approximately in the same direction, thus 
roughly grouping themselves into sets ; but as the field of observation 
is enlarged the counterbalancing effect of the various groups becomes 
evident. The displacements, therefore, are neither due to the splitting 
up of a single fault nor to the letting down of small w^edges between 
expanding joint- walls. 
It would require that a more extended series of these faults be 
studied before a really safe basis for deduction as to their structural 
significance could be attained. But I think that it is probable they 
