1Ingenious men; ſo, if I have not been
much flattered, I may hope that the vari
ous hints to be met with in the following
Letter, will (at leaſt) ſomewhat awaken
mens thoughts, & excite them to new ſpecula
tions (ſuch as perhaps even inquiſitive men
would ſcarce elſe light upon) and I need not
deſpair, that even the examination of ſuch
new Suſpicions and Enquiries will hence al
ſo, at leaſt Occaſionally be facilitated: I
ſaid Occaſionally, becauſe it being, as 'tis
proverbially ſaid, Facile Inventis addere.
It ſeems not irrational to expect, that our
Engine it ſelf, and divers of our Experi
ments, will be much promoted by the Indu
ſtry of Inventive and Mathematical Wits,
whoſe contrivances may eaſily either correct
or ſupply, and conſequently ſurpaſs many of
thoſe we have made uſe of. And, particu
larly, if Men by skill and patience can ar
rive both to evacuate ſuch Receivers as
ours, till there be no more Air left in them,
then there ſeems to have remain'd in the
Glaſſes made uſe of about the Magdebur
gick Experiment (hereafter to be mention
ed) and to keep out the Air for a competent
while, the Uſefulneſs and Diſcoveries of our
Engine, will not be a little advanc'd. And
perhaps that may belong to it, which I re-
much flattered, I may hope that the vari
ous hints to be met with in the following
Letter, will (at leaſt) ſomewhat awaken
mens thoughts, & excite them to new ſpecula
tions (ſuch as perhaps even inquiſitive men
would ſcarce elſe light upon) and I need not
deſpair, that even the examination of ſuch
new Suſpicions and Enquiries will hence al
ſo, at leaſt Occaſionally be facilitated: I
ſaid Occaſionally, becauſe it being, as 'tis
proverbially ſaid, Facile Inventis addere.
It ſeems not irrational to expect, that our
Engine it ſelf, and divers of our Experi
ments, will be much promoted by the Indu
ſtry of Inventive and Mathematical Wits,
whoſe contrivances may eaſily either correct
or ſupply, and conſequently ſurpaſs many of
thoſe we have made uſe of. And, particu
larly, if Men by skill and patience can ar
rive both to evacuate ſuch Receivers as
ours, till there be no more Air left in them,
then there ſeems to have remain'd in the
Glaſſes made uſe of about the Magdebur
gick Experiment (hereafter to be mention
ed) and to keep out the Air for a competent
while, the Uſefulneſs and Diſcoveries of our
Engine, will not be a little advanc'd. And
perhaps that may belong to it, which I re-