THE ANIMAL KINGDOM. 



11 



there is no agent to disturb it or impede the accuracy of 

 its tracings. For this purpose the workman himself does 



4. Binocular Microscope, Ijy Thomas Ross, Lonilon.' 



1 By the binocular arrangement the objects are seen with a stereoscopic effect. 

 The above instrument is shown upon one-fourth scale, costs £iO, and admits of 

 extra powers and apparatus being added to it. 



