& Odfervations on Animal Eleéricity. 
when conibed in the dark, always has a luminous appear- 
ance, as I have fometimes obferved myfelf. 
- XXIV. I have a white horfe, from the body of which, 
particularly im the winter-time, the comb brings forth abun- 
dance of fparks. T have likewife a white dog, from the back 
ef which, when I draw my hand over it, m @ warm room, 
from the tail to the head, {parks iffue with a {napping noife, 
and which feem fo troublefome to the animal, that he en- 
deavours to run away, I have fometimes charged a jar with 
thenr. 
XXV. I have often produced the fame phenomenon on 
an afhi-grey, firong, lively cat. 
XXVI. We are acquainted with three kinds of fifh which, 
when touched, give a fhock almoft like that occafioned by a 
charged jar, viz. the cramp-ray, Raia torpedo L.; the elec- 
trical eel, Gymnotus eleétricus L.; and the Szlurus elefiricus L. 
The more modern philofophers have convinced themfelves, 
by repeated experiments, that the effects of tlre fhock given 
by thefe animals are of an eletric nature, though to me it 
2ppears probable that they depend, in part, on another caufe. 
The animal electricity which I have announced in thefe 
mumerous infiances is of the coarfer kind, and may be eafily 
obferved by every one; but there is another kind, of a more 
delicate nature, which does not fpontaneoufly manifeft itfelf, 
but mutt be concentrated and called forth by art. This 
finer electricity I find firf{ mentioned in a letter of M. de 
Sauffure to the editor of the Jovrnal de Phyfique at Paris. 
The experiments which this celebrated philofopher made, 
partly on himfelf and’ partly on others, by means of Volta’s 
electrometer and condenfer, are given there only in extracts ; 
but the confequences he deduces from them are as follows: 
' In order to produce this eleétricity, bedily motion is ne- 
ecfary. The electricity thence produced arifes from the fric- 
tion of the body avain& the clothes; for as often as he made 
the experiment naked, he found no electricity. In order 
that electricity may‘be produced by the friction of the body 
againft the clothes, the latter nmft poffefs the natural warmth 
of the body; for when he had on clothes that were cold, he 
could never percetye the leaf trace of electricity: no elec- 
tricity 
