ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
435 
“ The whole apparatus is quite rigid. 
The arrangement for drawing with the camera lucida is of a high 
degree of perfection. I am often struck with the complication of the 
Fig. 34. 
Perspective view of Microscope mounted for purposes of investigation by 
daylight. Dimensions may be gauged by the diameter of the top of the 
stool v , which is 1 foot. 
various more or less expensive devices (always more or less imperfect 
too) attached to the camera lucida as now made, and having for their 
object the graduation of the light, so as to equalise the lights coming 
