THE 
PREFACE, 
T H E Philofophical Tranfa&ioris, ( begun to be Pub- 
lished by that indefatigably diligent Promoter of Lear- 
ned Correfpondence, Mr. Oldenburgh, the firfl vcho 
attempted any thing of this Nature ) having been f ef- 
ficiently known to the Curious, and always acceptable to the Lear- 
ned , when due care has been taken in the choice of the Code At- 
om fo recommended to the inquifitive and intedigent Reader ; .a 
long Preface mufl appear wholly unneceffary. 
However, it may not be amifs to inform the Learned and In- 
genious, of fome Particulars of the prefent Publifhers Defjgn : 
Which is ; 
Firft, To prefent the Pub lick with fuch fhort Trails, as might 
ctherwife be lofl to Po ferity, if printed - in fingle Sheets or Pam- 
phlets . 
Secondly, To give the Extralls, for the mofl part , of the 
Material, omitting the Preambles and Concluftons, and the ufelefs 
parts of fuch Letters as Correfpondents [bad plcafe to honour him * 
with, relating to the Improvement of Natural Philofophy, Ma- 
thematicks, or Mechanicks. 
Thirdly, To give an exalt account of [uch Experiments, as 
having been made before the Iduflrious Royal Society, 
they Jhad pleafe to order or permit the Publication of. 
Fourthly,, 
