PLATE 15. 
C.ZEISS, JENA 
Zeiss microscope stand I14, 
This form of microscope and that represented on plate 16 are the two patterns used princi- 
pally in the Laboratory of Plant Pathology, U. S. Department of Agriculture. The 
objectives are apochromatic, and have proved very serviceable. In carrying do not grasp by 
any part above the level of the stage, as this brings an undue weight upon the fine adjust- 
ment. Seize by the base. 
