( 6040 ) 
A Defcription of the Vfes of a certain Vowder for yklding vtrj 
fmooth and clofe M^d, and of eajier carriagey &c. 
THis was lately communicated to the Publiftier by a Ger- 
man PtiyfuiaojefidiDg at Frankfort on the Mayne, m 
High- Dutch ; the Englifti ot which is as follows • 
I . The Powder, I fpeak of,makcth the Mettalfo clofc and 
ftnooth, that ic leaves not the leaft pit io the piece, and that a 
Goo {o caft needs no boaring. 
2» One third of the Mettal may be fpared. 
3, Such Guns remain clean and neat a long while. In the 
Year 1672; July 9. there was caft a Demy^canon^ weighing 
54 hundreds of weight. This being tryed with a bullet of 54 
pounds weight;^ there was employed the firft time 12 pounds 
of powderjthe fecond time as much^the third time i $ pounds, 
and the fourth time 24 pounds^ ftrong powder 5 all which 
tryals it endured very well. Befides^, not long fince there 
Was caft a fmall Petard ofonly two pounds of this mettal^with 
which I broke in pieces a beam of a Rhine-foot (quare, the 
Petard remaining entire and perfedti 
When you have occafion to carry thefe pieces over land, 
you ftiall not need fo many horfes by far as otherwifc. And 
in great Ships and Galleons^ that are (bmetimes mounted 
with 100 Guns each, you may of the matter of 20© make 300 
Cuns,performing the fame,if not a better^cffeajf his Majefty 
be pleafcd to command a Specimen of this Powder for a good 
tryalj we are ready to fend it. It is not only cafie tp make^ 
but alfo of fmall expcnce^ 
Extr ails of two Letters of Dr^ Swamracrdam, concerning fom% 
Animals^ that havingLn^gs are yet found to he without the 
ArterioHs Vein*^ together with fowe other curious particulars^ 
WE (hall give the Reader both thefe Exirafts in the fame 
Language the Letters were written in. The firft was 
mmikn']fnmr. 24^ i^7Jt Amjierdam;^ vi^j 
