[ <W ] 
5 P erch far exceed in Size and Goodnefs any 1 have 
ever feen, being commonly 20 Inches long, weigh- 
ing Four or Five Pounds. They are taken only with 
Hooks, it being fo deep and ftony, that you cannot 
draw a Net : Theonly Bait for them is an Earth-worm ; 
the rocky Soil, and the Springs coming fo little a 
Way, affording them very little of that fortofFood.- 
XI. Extract of a Letter from Monfleur de 
Bremond, M. D. to 2 )r. Mortimer, con~ 
cerning a File rendered Magnetic al by 
Lightning. ’T r (inflated from the French by 
T. S. M. 2). F. R. S. 
I N N° 437. of the c Philofophical TranfaEfiom you 
have published. Sir, a Letter of Dr. Ccokfon y of 
Wakefield , on an extraordinary Effed of Lightning, 
which communicated Magnetifm to feveral Irom 
Tools I have received a Letter from the Coaft of 
St. Andre in c Dauphine y dated Sept. 7 « 173 9 - giving 
an Account of a Fad of the fame Nature, which I> 
here fend you as i received it. 
“ Three Weeks ago the Lightning fell 30 Paces 
“ from my Houfe on that of a Clock-maker. I fhall 
tc not enter into the Particulars of the Ravage it 
<l committed. Evcry-body knows how furprifing 
u the Effcds of Thunder arc: But here is one that is 
“ very lingular. The Thunder broke one of the 
“ Clock-maker’s Files, four Inches from the End; 
“ fo that there hill remained Seven Inches of it in the 
“ Handle; 
