214 R. B. Tolles on the Binocular Microscope. 
body of the microscope than the positive form, and for that reason 
is preferred. 
4°50 inches extension beyond the 
microscope body. The draw-tube 
can be as well withdrawn, and the 
eye-piece occupy its place, thus di- 
minishing somewhat the total ex- 
tent of the instrument. With 
proper modifications of the system 
~ division. 
