[ +38 3 
bitants of Swlfferland have fuffered great droughts m 
the fummer-feafons, fo as to dry up feveral fprings 
and rivulets, which were never known in any man’s 
memory to have been dried up. 
ExtraB ^LETTER XX. 
An Account of the Earthquake felt at Geneva, go- 
vern. 9, 1 / 55 ^ ^ Letter from MonJ. Trembley, 
Profeflhr of Mathematics there, to his Brother Mr. 
- Abraham Trembley, F. R, S. Tranfated from 
the French. 
Geneva, Decern. 16, 1755. 
Read Jan. 8, T Cannot tell whether the earthquake of 
1756- November i, was felt here. It was 
felt at Lyons. It is faid, that the waters retired for 
fome moments at the end of the lake of Geneva ; 
and that a motion was obferved in thofe of the lake 
On the pth of this month, a little before half an 
hour after two in the afternoon, in very fine and 
very calm weather, there was felt here in all the 
houfes in general a very great fhock of an earth- 
quake; but it did no damage. The motion was 
particularly remarked in looking-glafles and vvindovvs. 
Thofe, who were fitting, perceived, that their chairs 
fhook; and many thought, that they were going to 
fall. The fick felt the motion in their beds. The 
bells in the rooms of feveral houfes rang. The bell 
of the clock in the tower of the ifle of Rhone rung 
feveral times. The motion was felt even on the ground 
floor of houfes. I was then walking upon the 
Treille, 
