98 Dr. 'Falconer on the Knowledge 



h\a.(p!x.ri, or tranfparent. — i^riftophanes,* In other 

 places, mentions glais cups, as ufed for the pur- 

 pofes of drinking. 



A. C. 310. Ariftotle has two problems, rela- 



Aritlctie. tive to glafs. The firft endeavour- 

 ing to explain its tranfparency, the fecond, its 

 want of malleability. But the learned think 

 them both to be fpurious. There is, however, no 

 A. C. 303. doubt, that Theophraftus, the im- 

 Theophrailus. mediate fucceflbr of Ariftotle, was 

 well acquainted with glafs. He defcribes it as 

 bein"- made of the fand of the river Belus, f 

 which was called Yex.?, to which he adds, that the 

 commoncft kinds were mixed with copper. The 

 A. C. 209. celebrated fphere of Archimedes,:|: if 

 Archimedes, truly defcribed, is a remarkable in- 

 ftance of the perfedion to which the art of 

 making glafs had been brought, al an early 



period, 



■[ E» ii vt7\<>i £X Td? tiE^tcbj fc'5 TiKEj fctffi }t-. avr-T) irvy.iaan yi>e« 

 tai- »Ji«T«Ty) ^B r, ru xctXy.u ii.\yrjy.irn. Theophr. 



Ita (ytTii; fcilicet) vocant arenam vitro conflando ido- 

 Jieaiii, quK in Beli amnis ripis & alveo reperiebatur. 



Sahnafius. Plin, Exerc. p. "JJl, 



X An Archimedes Siculus concavo rere fimilitudinem 

 mundi, ac figuram potuit machinari, in quo ita folem, ac 

 lunam compofuit; ut in<xquales motus & ca:leftibu$ fimiles 

 converfionibus, fingulis quafi diebus efficerent : & non modo 

 g^ccffus folis, & receffus, vel incxementa, diniiautionefque 



