C 960 ) 
lule of Air as B has been above a larger as A. u 
Globule has not nfen upward to C, and !o to D, tnc 
bten thruft downwards to A y whence it wasdiftanta- 
bcur two hair's breadths, and iff :iy upon t: 
ing united therewith. I have Lkewifc obferved, that a 
little Air-bobble as 0 \ bofeoiog itftif from the (b 
whea a larger Bubble, as F. was underneath it, his there 
refted immovable in the Liq-ior, a hen at the fame time 
other much fmailer Bubbles have nfen to the top thereof. 
The reafon of the ftandi^g ftill of rheBuotle G y Ifuppofc 
ffas fcomadon hlf mociaH it is lrnpeiied tojhe oneupua-ds 
from its being fpecifica'iy higher dun the Liquor, the 
other downwards, by Winch it was protruded, tojoya 
with tne other larger Babble F. Tho I have feen ft. 
Effefts of Sympathy, if we may to call it, yet I never 
faw anv fomaf :: eft :s this, 0: ^ : rending of a Bubble 
contrary to its levity, to unite w A th another. 
IV. An In fiance of the Excellence of the Modern 
A L G E BRA, in the Kef hit ion of the 
FrobUm of finding the Foci of Optick G/jjfts 
univerfally. B) E. Hal ley, S. R 5. 
TH E Excellence of the Mtdern Geemetry is in no- 
thing more evident, than in thole full and ade- 
quate Solutions it gives to i ~s : r ^ 
po&bk Cafes at one view, and in one general The : . m 
Btany times comprehending whole Sr.e'res ; vbkb de- 
doced at length into Propofirioas, inc. demoaftratcd 
the manner cf the Avcients, might vc . tea; tnc the Sub- 
jects of large Treaties: For whatfeever Theorem ic. res 
the inoft complicated Problem of the kicd, does with a 
due Redu&ion reach all the fubordinate Cafes. Of this 
I 
