( ) 
and ebb about nine or ten Times, according to ano- 
ther Account which I have received; but of this I can 
aflert nothing certain, or upon my own Obfervatiohs. 
The Doctor adds, that when the Water in the Bafon be- 
gan to rife, he obferved a Bubbling in the Bottom of the 
Bafon, which ceafed when the Water began to fink. 
This I did not fee, becaufe the Springs were finall and 
low, by means of a dry Seafon ; but it was confirmed to 
me by the Report of Eye-witnelfes, as is before obferved. 
Having thus compared the two Accounts given of 
this Fountain, I come now to my Hypothecs, for 
explaining the Phenomena obferved by me j and I ima- 
gine thein to be occafioned by two Streams or Springs, 
one of which pa (ling through two Caverns or natural 
Refervoirs with Syphons, meets with the other Stream 
in a third Refervoir without a Syphon; where being 
joined, they come out of the Earth together. This 
complicated Piece of Machinery will be belt under- 
ftood by beginning with an Explanation of the more 
Ample Parts firft y in doing of which, we fliall havearr 
Opportunity of confidering fome other Sorts of Foun- 
tains, which have already been obferved, or may here- 
after be found to be in Nature. 
The Petitio Principii, or Suppofition of Refervoirs 
and Syphons in the Bowels of the Earth, has been made 
by others : PereRegtiauU, in his Phil. Conversions, 
Vol. 2. Conv. 6. p. 125, < 3 ec. Eng. Edit . has men- 
tioned it in general, and Dr. Defaguliers , in Phil. 
Pranf. Numb. 384, has attempted to apply it to 
two Cafes in particular ; as DechaJes, Tract, xvii. de 
Fontibus Naturalibus, &c. Prop.xv. had done in 
two other Cafes before him. Nor is it unnatural or 
hard to be granted. Whofoever has feen the Peak of 
j Derby-. 
