IOHN MARSHALL'S 



New Invented 



DOUBLEMICROSCOPE, 



For Viewing the 

 ClRCULATIONoF the BLOOD 



Made &? Sold bv him af <he Archimedes &S 

 Golden SpccOaclea in Lucivsue Street. 



TUa. du 



\v 





FIG. 104 (1704>. 



