COMPOUND MICKOSCOPE BY JAMES MANN. 



319 



on the contrary the probabiUty is that it was made much earlier, 

 and that Ellis had been working with it some years in the 

 preparation of his book. Similarly Adams may have made 

 Cuff's microscopes some time before the publication of his 1771 



illustrated catalogue. The discovery of this dated microscope 

 affords, therefore, strong evidence that Cuff must have given up 

 business or died before 1751. 



The name S. Johnson is engraved on the stage plate, and it 

 is almost certain that this microscope was the property of 



