C 396 ] 
pure as before ; and continues ftill to do fo j but it 
fupplies more water than ufual, and that hotter, and 
more impregnated with its medicinal quality. 
You lee, Sir, that the alteration made in this 
fpring happened almoft at the very time when Por- 
tugal began to be fhook with the earthquake. Not 
doubting therefore, that accounts from various parts 
concerning the efteds of fo cxtenfive an earthquake 
will be fent to the Royal Society, I prefum’d, that 
this would not prove unacceptable to them. I am, 
S I R, 
Your moft humble fervant, 
J. Steplin. 
Extras 0/ L E T T E R XXVI. 
From Mr. De Hondt, of the Hague, concerning theAgi^ 
tation of the Waters., Novem. 1. lyff. Tranfated 
from French, and communicated by Tho. Birch, 
D\ D. Secret. R. S. 
Hague, Nov. 7, 1755. 
Read Nov. 20, T V TE had, on Saturday morning laft, 
1755- W at eleven o’clock, a phenomenon,, 
which aflonifli’d every body. In abfolutely calm 
weather there, was obferved of a fudden fo violent a 
motion in the water, that the fhips were ftruck-againfl 
each other, and broke the cables, which faften’d 
them. It was felt at the fame time at the Hague, 
Leyden, Harlem, Amllerdam, Gouda, Utrecht, 
Rotterdam, and Boifleduc. At the Hague it was 
but 
