14 HISTORY OF THE MICROSCOPE. 



those of all other countries. Messrs. Powell and Lealand's 

 microscope, with object-glasses, was selected by the Royal 

 Society as the best against all competitors. See Juries' 

 Reports for much interesting matter on this subject; 

 article " Microscope" Penny Cyclopaedia, by Mr. Ross ; 

 Practical Treatise on the Microscope, by Professor Quekett; 

 Sir David Brewster's Treatise on the Microscope ; Dujardin'a 

 Observateur; Maudl, Traite pratique du Microscope; Dr 

 Robinj Du Microscope, &c. 



Fig. 5.— Baker's Scroll or Pockrt Microscope, and the Modern Compound 

 Microscope of W. Ladd's mwiu/acture. 



