[ 477 1 
Now all Animals, on which Experiments have been 
made, are found to contain more or icfsof the phol* 
phoreal Principles ; fome Infeds conftantly fhine, or 
emit Light, in the open Air ; many Sorts of Fifh arc 
luminous, if expofed to the Air a fhort time; nay 
even the Bubbles of the Sea-water appear like Fire in 
the Dark : fome Quadrupeds have been obferved to emit 
Light on very flight Fridion of their Hair, as the Necks 
of Horfes, the Backs of Cats, and the like ; and there 
are many Inftances in our own Species, of many Parts 
of the Body appearing luminous, and even of the 
Exhalations from it adhering to the Cloaths, caufing 
them to fhine likewife ; of which fevcral curious Ob- 
fervations * have lately been laid before this Society : 
Thefe, I think, are convincing Proofs of c Phofpho- 
rus exifting, at leaf! in a dormant State, in animal 
Fluids;andas it islikewife certain, that they all contain 
Air, it is only neceffary to bring the phofphoreal 
and aercal Particles to Contad, and Heat mull of 
confequence be generated ; and was it not for the 
Superabundance of aqueous Humours in Animals, I 
do not doubt, but fatal Incenfions would frequently 
happen. This, I think, explains evidently the Caufe 
of animal Heat : Indeed the Heart and Arteries are 
the Inftruments which excite this Heat ; but that is 
not done by the Fridion caufed by the Circulation 
of the Humours, but only by the inteftine Motion, 
which the Circulation gives to the feveral Particles 
which conftitute the Mafs of animal Fluids j and 
as the Velocity of thefe Fluids is increafed, fo mud 
the different Particles, of which they conlifl, come 
oftener 
* See above in this Tran/, p. 444. 445. 456. 457. &V, 
p P p 
