( i<S* ) 
Pain refembling that from the fudden Prick of a Pin, 
or the burning from a Spark of Fire, which is asfen- 
fiblyfelt thro’ ones Cioaths, as on the (bare) Hand 
or Face. And in the Dark thefe Snappings are, as 
may be ealily imagined, fo many Sparks of Fire. 
Thefe Snappings, or Sparks, are not excited, if a Bit 
of Wood, Cloth, or any other Subfiance than a li- 
ving Body be paffed over the Perfon fufpended on the 
Lines, unlefs it be a Piece of Metal, which pro- 
duces very nearly the fame EffeCt. Any other living 
Animal doth the fame, if put on the Lines, andthat 
firft theTube, and then die Hand be applied near it: 
But it is otherwife, if the Experiment be made 
with the Carkafs of an Animal ; for then one 
perceives only, if it be in the Dark, a ftill uni- 
form Light, without Snappings or Sparks. I 
omit many other Circumftances of lefs Importance, 
though curious, to avoid running into too great a 
Length. 
Sixthly , On making the Experiment related by 
Otho de Guerik, in his Collection of Experiments 
de Spatio Facuo, which conlifls in making a Ball 
of Sulphur render'd EleCtrical, to repel a Down- 
Feather, I perceived that the fame EffeCts were pro- 
duced not only by the Tube, but by all eleftrick Bo- 
dies whatfoever ; and I difcovered a very Ample 
Principle, which accounts for a great Part of the Ir- 
regularities, and if I may ufe the Term, of the Ca- 
prices that feem to accompany raoft of the Experi- 
ments on EleCtricity. This Principle is, that E- 
le&rick Bodies attract all thofe that are not fo, and 
repel them as foon as they are become eleftrick, by 
the Vicinity or Contact of the eledrick Body. Thus 
Leaf- 
