JOHN MARSHALL'S 



tf:u urulfr y 



New Invented 



DOUBLEMICROSCOP 



For Viewing the 



CIRCULATION o 



Ma-Jc &.-.Sold bv him a( (Kc Archimedes &s 

 Goldiu Spcx-lacles in Luda(e Street. 



\v 



'"I 1701 . 



