662 PHARMACEUTICAL BOTANY 
forms of stands have been devised which have been combined 
with an arm and lens to constitute what are known as ‘‘Dissect- 
ing Microscopes.” One of the simpler forms of these is shown 
Fic. 491.—Zeiss stereoscopic dissecting microscope with built in illuminating 
equipment. 
in Fig. 490. It consists of a metal stand with convenient hand 
rests; a glass stage plate, full size, on which the object to be dis- 
sected is placed; a double faced mirror adjustable for reflecting 
light from various angles, the concave face for concentrating all of 
the light at the plane of the object. A jointed lens arm is carried 
