SE/CHES OF THE LAKE OF GENEVA. 199 



2. It appears, however, to be true, that the phenomenon But moft 



,,,..ii c ^ .i l ftrikingly in tbe 



is more, remarkable in the lake of Geneva than any where lake Le ^ ai)4 



.tflfe that it has been obferved. In fad, the level of the waters 



of Leman lake have been feveral times oblerved to rife at a 



given place in the couile of 15 or 20 minutes, three, four, 



and even five feel, and to fubfide forae lime afterwards, 



whereas the ftrongeft feiches oblerved in other lakes, have 



,been four or five inches in the lake of Coniiance, eighteen 



lines in that of Zurich, four or five lines in that of Annecy, 



and only a few lines in the lake of Neuf-Chatel and lake 



Major. 



3. In all thefe lakes, particularly in that of Geneva, the More confide*, 

 feiches are moft fenfible in that part of the lake which ' s ^"of efflux, 

 neareft the outlet of its waters. Accordingly they are no 



more than one or two inches, at the diftance of two leagues 

 from Geneva, and at the extremity near where the lake re- 

 ceives its waters the feiches of the lake of Geneva are not 

 Wronger than thofe of the other lakes here mentioned. 



4. In thcfe different lakes they are moft fen fible in places and where the 

 i ,i , , i li fhores are not 



where the lake is remarkably narrow. farafunder- 



t 5. The feiches may take place indifferently at all feafons of they happen at 

 the year, and at any hour of the day; but in all the lakes ^™? and 

 it has been obferved, that they are more frequent in the day 

 than in the night, and in the fpring and autumn, than in the 

 winter or fummer. 



0. It has been obferved in particular in the neighbourhood but moft ftrik- 

 of Geneva, that the ft ron^-eft feiches take place at the end of '"S 1 ? when th * 



h r waters are 



Xhe fummer, that is to fay, at the time ol thegreateit elevation higheftj 



of its waters. ,^ \. A .# ufa' 



rj .3fj.The feiches are extremely frequent, but they are ufually 



a few lines, or at moil only a few inches, in which cafes they 



cannot be perceived without exact apparatus to obferve the 



level of the lake. It is from a want of this obfervation that 



they have been fuppofed to be very rare, as thofe feiches only 



could be obferved without apparatus which varied feveral 



feet. 



8. The feiches take place without any agitation or motion attended with no 

 af undulation or current in the furface of the fluid. ' _J 



9. Their duration is very variable, feldom exceeding twenty anJ do not laft 

 4jr twenty-live minutes, and often much lets. 



10. This 



