(3 
20. If in the Euxin-Sea there can be found any fign of the 
Cafpian-Sm emptying it felf into it by a paffage under ground- ? 
If there be any different Colour, or Temper as to Heat or Cold 5 
or any great Current or Motion in the Water, that may give 
light to it ? 
2 1. By what Inland paiTages they goto; China ^ there being 
now a paflage for Car mums throughout thofe places, that Would 
formerly admit of no Coprefpondence by reaibn of the Barba- 
rifme of the Inhabitants f 
22. Whether in the Aquaedu&s, theymake, they line the in- 
fide with as good Plaifter, as the Ancients did > and how theirs 
is made ? 
23. To inquire after thefe excellent Works of Antiquity, of 
which that Country is full, and which by the ignorant are not 
thought worth notice or prefervation ? And particularly, what 
is the bignefs and ft rupture of the Aquaedu&s, made in feveral 
places about Conjlantinople by -Soly man the Magnificent ? &c % 
An Obfervation of Oj)tic\Glaffes , made of 
Rock-Cryftal*. 
This is contained in a Letter, of Euftashio fiivim, Printed in 
Malian at Rome*, as the 39. Journal des Scavans extra&s it 'yvid. 
Thoughit be commonly believed, that Rocl^CrjpJlal is not fit 
for Optick-Glafles, becaufe there are many Veins in it 5 yet 
Ettftachio Divtni made one of it, which, hs. Jaith proved an ex- 
cellent one, though full of Veins. * 
be queried whether thole were true Veins, or only Superficial Striftures, 
a. d flight lcr.’tchcs. 
An accompt of the Vfe of the Grain of Kermes 
for Coloration. 
This was communicated by the Ingenious Dr. Croon*, as he re- 
ceived it from one, Monfieur Verny^ a French Apothecary at 
Montpelier 5 who having deferibed the Grain of Kermes , to be 
at\excrefco3ce ? growing upon the Wood, and often upon the 
leaves. 
