6o 
cxa£\:ly Stroke for Stroke to the AtHon of the 
fcratching Nails. Thus particularly on fcracch- 
ing a (inall Pimple, a little below the right 
Knee on the outfidc, a like pungent Senfation 
has been felt on the left Shoulder Blade, and 
fometimes on that Arm fome Inches below the 
Shoulder : And vice verfa the right Shoul- 
der or Arm has in like manner been aflFeft- 
ed, when the fcratching has been made near 
the left Knee, but this Effeft does not always 
follow : There are many Inftances of the Sym- 
pathy of the Nerves. 
i8. That the animal Spirits, whether they 
aft within or on the Outfides of the Nerves, 
arcelaftick, feems probable not only from their 
great Aftivity and Energy ; but alfo from the 
lliddcn and ftrong Eftefts that fulphtireous Va- 
pours, which arc known to deftroy Elafticity, 
are found by experience to have on them. Thus 
the Fumes of burning Brimftone will inftant- 
iy deprive all Animals whatever of Life ; Thus 
alfo the fubtile and mod: penetrating Fumes of 
fermenting fpirituous Liquors, are known ci- 
ther to ftrike thofe inftantly dead who fmcll 
to them, or to infatuate or render Paralytick 
for Life, thofe who fmellto them in lefler De- 
grees, Thus alfo the (ulphurcous fcccid Fumes 
of 
