A TREATISE 



ON THE PROPERTIES AND QUALITIES OF GLASSES 

 FOR OPTICAL PURPOSES, 



ACCORDING TO THE MAKING, POLISHING, AND GRINDING OF THEM. 



BY WILLIAM BOURNE. 



FROM MS. LANSD. MUS. BRIT. 121. 



EPISTLE DEDICATORY. 



To the Right Honorable, and hys singuler good 

 Lorde, Sir Wilyam Cicil, Baron of Burghley, 

 Knight of the moste noble order of the garter, 

 Lorde Highe Treasurer of Englande : Mr. of the 

 Courte of Wardes and Liverys, Chancelour of the 

 Vniversity of Cambridge, and one of the 

 Queens Majestie's Honorable Privy Counsel]. 



Right Honorable, fynding myself moste deepely 

 bounde, vnto youre Honour, in dyvers respects : 

 And allso youre Honours moste excellent and 

 worthy skilles, and knowledge in all notable, 

 laudable and noble experiences of learning in all 

 maner of causes : And allso, for that of late 

 youre honour hathe had some conference and 



