( 3239) 
Numb. 75. 
PHILOSOPHICAL 
TRANSACTIONS. 
Sepemb.iQ. 1671. 
The CONTENTS. 
Supplement to what was fublijhit N. 73. of the Compreffion of 
h\T under Vf^XQT» An Anfwer to Four Papers of Mr, Hobs^ ' 
lately publi/h't, Nerv Obfervations of Spots in the Sun* An Ac^ 
€ompt touching Vegetable Excrefcencies* J Defcriftion of fome 
Books : I. (§ II. LeBiones OPTICJE ^ GEOMETkjCjE.Auth. ^ 
Ifaaco Barrow * together with a Mantiffa of the fame Author to 
fome of thofe tenures. III. Continuation of the MEMO IJ^ES * 
ofM. Bcrn'iQr concerning the Empire oj the MogoL IV. Hi-^ 
floria ^ Meteor ologia INCENDIl jETN^h A.1669. Juth, 
Joh^Alph.Borello. Advertifement touching the Lzim Ferfon of 
part of thefe Tranfa<9:ioDS, 
A Supplement t© what was publi/h'tNn 73* of the Compreffion of 
Air under Water. • 
AT the defire of a particular Friend,the Scheme in Tab^ L 
FigX was drawn,and is now permitted to be made pub- 
lick at the requeft of another, by way ot Suppiemenc 
to what was faid in the Philcfophical TranfaUions N* 73, of the 
Compreffion ot Air under Water : In which Figure 
ED is made to reprefent the Tube, s=x; 
ABthe diftance of the upper part of the Tube from the fur- 
face of the water above or under it^ b* 
FC the depth of the water from its furface to the bottom of 
the Air within the Tube^ ~ a* 
BC that part of it which remiiins fill'd with Air within the 
Water. 
CD the reft thereof which is full of water. 
N n n And 
