227 of the Air may be (uppos'd indefinite s 
228 to what degree the Air ts rarifid at 
any diftance above the Surface of the 
Earth : how, from this, Inflectionis 
229 inferr’ds and feveral Phznomena 
230 explain’d. That the Air near the 
Earthis compos'd of parts of differing 
231 denfity; made probable by feveral 
232 Experiments and Obfervations ; how 
this propriety produces the effetts of 
the waving and dancing of Bodies ; 
Rees of. the, Stars. 
i Phaswomera explicate. | arp 
Some Queries added. — 
1. Woether this Principle may not 
be made ufe of, for perfecting Optick 
234 Glaffes ? What might be boped from 
it of at were to be done ¢ 
2. Whether from this, Prepeipl 
“the apparition of fome net Stars ma 
not be explicated ? 
Surface £ 
. 5. Whether, if fo, this will not ex- 
35 plicate the Phenomena of the 
Clouds. An Experiment to this pur- 
7. Whether the Rayes from the 
ains ate -not.bended into 
“> Criroe-lines by inflettion,? An Argu- 
ment for it,raken from an Experiment | g 
made on St, Paul's Steeple. 
3. Whether the diftance of the 
Planets wilh not be more difficult to 
237 be found? What wayes are moft lthe- 
ly torettifie the diftance of the Moon: 
the #i of fitting Telefcopes for | /é 
fe 
fuch Obfervations. How te make the 
323 Qvfervations » and how from them to 
3 find thetrue diftance of the Meon at 
any time, Hore the diftance of the Sun 
may be found by two Obfervators. The 
739 may by the Dicotomy of the Moon un- 
certain. That the diftance of the 
Moon may be le/s then it has been 
bitherto fuppos'd. Kepler’s Suppofit7- 
onnot [0 probable: the explication of 240 
if ee by another Aypo~ 
thelisy, r 
Obferv. $9. Of the xt Stars; 
Of the multitudes of Stars difco- 
verable by the Telelcope, and the 
vartety of their magnitudes:78, Stars 
lades:tvat there | 
Be 
24r 
ay oli 
accounted of the [ame magnitude : the 
longer the Glafes are, and the bigger 
apertures they wtll indure, the more 
2 : . * 723 48 Eo, 1; isppl . re 
:sulfjty hetteert the upperand.under parti, 
"OF DE Air, as to make w reflecting 
: > seOpe ities @ <t.4:8 / vee! 
fit they are for thefe difcovertes : that 
‘tes probable, longer.Glaffés would yet 
megke gepat difcovertes, §. Stars 343 
difcover'd in the Galaxie of Orion’s 
Sword, 
3. Whether the heig bt of the Air» ee ee 
ee er ae the Moon....¢ 
511 ge Whether there aay te Jomen |. A Me Viale in the! 
2 bimec be fo great a wifparrty of dem» M y\Hevelius ands." 
; 
bi: 
i) 
their effets feem very fimilar.dn Are 
gament that there may be [uch varia~ 
tions inthe Moon, besaufe greater 
have been obferv'd in the Stn:becaufe ,4¢ 
the /ubftance of the Moon and Earth 
zem much alike: and becau/e “tis pro- 
bable the Moon has a gravitating 
principle : this is argued from feverat 
particulars, Thereafonwhy feveral 46 
pits arene within another. The u/e 
that may be made of this Inflance of 
a gravity tn the Moon, | 
ERRATA 
