who fliall fecthefe GlaffeSihow they couldbe truly wrought 
to fuch a Figure, with fuch a Cavity 5 & yet morej when they 
ftiall hear the Author undertake to excavate other fuch E/e- 
Glares to above two inches , and Ohjedt-glajfes of five inches 
Diameter. He hath likewife already begun his 0hjc3-glajf€s 
for the mentioned two Ocular ox\t%^ of the fame Figure of 
about two inches Diameter^ which are to be left all open^ yet 
without caufing any colours. Of all which 'tis hoped ^ that 
fliortly a fuller and more particular accompt will be given* 
Monjtenr Auzout's Speculations of the Changesjik^ly 
to be dif cohered in the E^^tth and Moon ^ by their 
refpeSii've Inhabitants, 
This Inquifitive Philosopher in a letter of hisjately written 
to his corrcfpondent in London , takes occafion to difcourfe 
of his conGderations concerning thofe Changes, mentioned 
in the title^ as followes h 
I have C faith he ) fometimes thought upon the Chctngef^ 
which 'tis likely 5 the fuppofed Inhabitants of the Moon 
might difcover in our Earth y to fee 3 whither reciprocally I 
could obferve any txxchmiht Moon. For example , me* 
thinks 3 that the E^r/A would to the people of the ap- 
pear to have a different face in the feveral feafons of the 
year 5 and to have another appearance in Winter^ when 
there is almoft nothing green in a very great part of the 
Bitrth 5 when there are Countries all covered with fnow ^ 
others 5 all covered with water 5 others , all obfcured with 
Clouds , and that for many weeks together : t/4notherm . 
Springs when the Forrefts and Fields arc green, j^notherin 
Stimmer , when whole Fields are yellow &c. Me thinks, 
I fay, t\\2it thefe changes are conGderable enough in the force 
of the reflexions of Light to be obferved , fince we feefo 
many differences of Lights in the Moon. We have Riven 
confidcrable enough to be feen , aqd they enter far enough 
into 
