( 2^^) Num, id, 
PHILOSOPHICAL 
TRANS ACTION S. 
The Contents. 
AnE(fayof Dr. John ^tlMs, exhibiting his Hypothefis about the 
Flux and Reflux of the Sea, from the Confideration ef the 
Common Center of Gravity of the Earth and Moon 5 toge- 
ther with d« Appendix of the fame , containing an kwiwcv to 
fome Obje<9:ioDS, made by feverall Perfons agamjl that Hypo- 
thefis. S@me Animadverfions of the fame Author upon Mafler 
Hobs*s late BeoJ^, De Principiis & Ratiocinatione Geome- 
trarum. 
AnEjfay 
Of Dr. John Wallis , exhibiting his Hypothefis about the 
Flux and Reflux of the Sea. 
Ow abftrufe a fubjedl: in Philofophy , the 
Flux and J{eflux of the Sea hath proved hi- 
therto, and how much the lame hath in all 
Ages perplexed the Minds even of the beft 
of Naturalijli ^ when they have attempted 
to render an Account of the Caufe there- 
ofj is needlefs here to reprefenr. It may 
perhaps be to more purpofe, to take notice , that all the defici- 
encies, found in the Theories or Hypothejes , formerly invented 
for that End, have not been able to deterre the Ingenious of 
this Age from making farther learch into that Matter : Among 
whoni that Eminent Mathematician Dr^ John Jf^allis, foWow'wg 
his happy GmW for advancing reall Philofophy^ hath made it 
a part of his later Inquiries and Studies , to contrive and de- 
duce a certain Hypothefis concerning th^t PhanomenQn^ taken 
N n from 
