[ *46 ] 
XL IV. A Letter to the Marquifs of Rock- 
ingham, with J'otne Observations on the 
Effects of Lightening . 
To the moft honourable the Marquifs of Rockingham. 
My Lord, 
Read July 28, y Have taken the liberty of addrefflng 
. A the inclofed paper to your Lordfhip, 
as it contains a few obfervations on a fubjedt not un- 
known to you, and may probably be thought of ge- 
neral ufe. & 
I have a further reafon for addrefling it to your 
Lordfhip, as it gives me an opportunity of expreflino-, 
m l'ome fmall degree, the high fenfe of gratitude^I 
bear your Lordfhip, for many and repeated favours 
and obligations conferred on, 
My Lord, 
Your Lordfhip’s moft obedient. 
June 24, 1764, 
Crreat Queen-ftreet, 
London. 
and moft humble fervant, 
Benjamin Wilfon. 
LONG 
