f 21 ) Mmki^z» 
PHILOSOPHICAL 
TRANSACTIONS. 
Jfril 27. 1674» 
The CONTENTS. 
Confiderations of MrXeewenhoeck touching the Comprefji^n of 
the Air. More <^Ucro[copica,l Obfer^uathns made by the fame ; 
fromis'd N°. 97. of thefe Traffs ; they are about Bloody Milk^ 
Hair^ JSfailsy &c. Sir Sam. Morelands undertaking for rat- 
Jing of Water. A Note about fome unufud Diamonds^ A cer» 
tain Phcenomenon^ feen by M. Hevelius in Boruilia abot^t the 
Sun. Jn Extract of a Letter from the fame^ concerning the 
Manufcrifts of the famom Kepler ; together with fome Conji- 
derations of his^ touching the ufe of Telefcopic Sights in A- 
JlronomicalObfervations, Jn Accornpt of tm Books : I. Jo- 
harnis Schefferi LAPPONIA. ILthe true E N G LI S H 
JiVrfiiJJESr by CAREW R E YN EL, An 
Advertifement concerning a Nevp fiz>e of GLOBES reSii^ 
fied. 
Conjiderations of Mr. Leewenhoeck, touching the ComfreJ/ion of 
the Air 5 fent to the Fublijher in his Letter of Auguft 1 5, 
1673. 
I Cannot forbear to give you my thoughts concerning the 
Comprefllon of the Air. I take a narrow g^afs-pipe, as 
here (in Fig.i.} A B, hermetically fealed above in A 5 which 
pipe I fill about haif full of water, asEB: Into it I in- 
fert the forcer D C, which is a wire , wound about at D with 
a piece of leather fitted into the glafs-pipe, but firft thruft in- 
to hot Candle-greafe, that fo neither Water nor grofs Air 
D may 
