20. If in the Euxine-Sea there can be found any fign of the 
Cafpian Seas cmpty\ng\t felfinto it by a paflage under ground? 
If there be jany: different Cqlour, or Temper as t9 Hea^ or 
Cold 5 or any greac Current or Motion in the Water, that may 
e've light toit ? 
2 1 . By what Inland pafTages they go to China 5 there being 
yow a paffage far ;f.^?r<?z;^;?/ throughout thofe placesjthat would 
formerly sdmirot no Correfpondence by reafonof theBarba- 
rifme of the Inhabitants r* 
22. Whether ill the Ag^isedudls, they raakei they line the in^ 
fide.with as gopd PlaiBer, as the Ancients did ? and hpw theirs 
is made ' * - \ .;. :, v.sv7: V- 
23. To inquire after thefc excellent WprK of Anti^ity, of 
which that Country is fuHj and which by the ignorant are not 
the ughc worth notice or prefervation f And particularlyj what 
is t4 eb g icfs and ftruifture of che Aquseduds, made infeveral 
place, about CoNjlamino^Ie bYSsQlyM^nthQM^gn'i^^^ &c. 
An Ohjervatton of Oftic\ Glafjes made of 
Rock-Chryftal* 
This is contained in a j^ettcr^ol EuJlaehioDivim^Vr'mttd in 
JtallaH at Rome, as the 3 9* jQurmldes Scavans extradis it y vid. 
Though it be commonly believed^ that RocJ^^Chn/i-dl is not fit 
for Optick-Glafies, becaufe there are many Veins in it 5 yet 
EuJIachio Divini vn^^Q one of it, which he faith proved an ex- 
cellent one, though BH Veins. 
* Tt may. be queried whether thofe:wcr« tfue Vcins,oy only Superficial St3:idturc5(> , 
and flight fcratdies. 
AnAccomp of the ZJJeoftbe Grain ^jf Kermes- 
for Coloration. - 
This was communicated by the Ffig^dious pr» Cri^ow^as he re- 
ceived it from one ^onfitxxt FernyyZ French Apotbecary at 
Jkfuntpeher 5 who having defcribed the, Grain qi JQrmes, to be. 
aA excrekence growing upon ti>e Wood, and often upon the 
leave^ 
