[ 70 1 ] 
when, after the great Shock upon the 24th of March t 
there were fome Shocks every Day for a Month; fo 
that few or none went into Houfes before the latter 
End of April : When I had time enough to obferve 
their Motion, which was regularly periodic, or about 
the fame Hour every Day. But I muft differ from 
this unknown Gentleman's Opinion fo far as to fay, 
that every one of thofe Shocks was lateral, moving 
from the South to the North ; and, as near as I could 
judge, the Motions formed acute Angles, fomewhat 
rcfcmbling the Motion of Lightning. 
XLVII. 
Part of a Letter from William Folkes, Efq\, 
F. R. S. to his Brother the Prelident, con-- 
cer ning a Shock of an Earthquake felt at 
Newton in Northamptonlhire, on Sunday, . 
September 30. 1750. 
25. N Sunday laft, rather before One, . 
an Earthquake here. The Noife, to the beft of my 
Jud gment, continued near a Minute ; but was not 
fo loud as either of thofe I heard at London . Seve- 
ral of the Congregation perceived the Ground trem- 
ble; but I cannot fay I did. It is faid to have been 
more violent in feveral Places in the Neighbourhood 
than here j but this I much queftion, Aifo the Day 
Mordach Mackenzie, 
Dear Brother . 
whilft we were at Church, we had 
)wens 
