ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



655 



The stage, which is controlled by two milled heads on one spindle, is 

 provided with millimetre scales and verniers reading to ^V I'l'^i- i^iv i".)- 



Fig. 124. 



Greenough's Stereoscopic Binocular Microscope.* — The firm of E. 

 Leitz have improved this instrument in the direction of stronger con- 

 straction, giving greater rigidity. The stand is provided with rack-and- 



* Leitz Catalogue 44a, |pp. 82-3. 



