[ 445 1 
dances -of thcfc lucid Effluvia ; and fays, he has there 
fhown the Caufe of them at large; but, as I have not 
yet got a Sight of that Book, I can fay nothing fur- 
ther only, that in the fecond Century of the 
Hiftories above-mentioned, Hiftory xn. he afferts, 
that he has prov’d, in his Book de Luce , &c. that Light 
is connatural or innate to all, as well Vegetables as 
Animals. 
There is another Author, Dr. Shnpfon , who pub- 
lifhcd a Philofophical Difcourfe of Fermentation, 
dedicated to the Royal Society , Anno 1 675. who 
takes notice of Light proceeding from Animals, on 
the Frication or Pe&ation (as he calls it) of them * 
and inftances in the Combing a Woman’s Head, the 
Currying of a Horfe, and the Frication of a Cat’s 
Back ; the two lad of which are known to mod. I 
cannot tell whether it be material to add, that, ac- 
cording to this Gentleman’s Hypothecs, he would 
adign the Principles of Fermentation, which he fup- 
pofes to be Acidum & Sulphur , as the Caufe of thefe 
lucid Effluvia in Animals. His Hypothecs 1 may 
not take upon me to judge of ; but I humbly appre- 
hend, the Properties of the Effluvia in animal Bodies 
are many of them common with thofe produced from 
Glafs, <&c. ; fuch as their being lucid, their Snapping, 
and their not being excited without fome Degree 
of Friction, and, I prefume, I may add, Electricity j 
for 1 have, by repeated Trials, found a Cat's Back 
to be ftrongly ele&rical, when flroak’d. 
I mud intreat your Candor in excufing the Errors 
and Imperfections you may obferve in this Paper to 
my prefent weak State of Health > and I was un- 
willing to delay any longer a fmall Teftimony of 
L 1 1 my 
