ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
The bellows carries a union formed of two pieces, one fixed on the 
camera and the other screwed on the body-tube of the Microscope. 
These two pieces aro froo, one in the other, so that the movements given 
to tho Microscope are independent of the camera. 
Nachet's Camera Lucida. — The instrument seen in fig. 8 is a modi- 
fied form of the camera lucida described in this Journal, 1887, p. 61 9. 
It carries two racks, one for adjusting the camera lucida, the other for 
Fig. 8. 
adjusting the stage beneath the lens P. The modifications in this model 
consist : — 
(1) In the addition of a stage adjustable in height so as to bring the 
object into the focus of the lens, while the camera lucida is kept at the 
same distance from the table on which the drawing is to be made. 
(2) In the possibility of drawing beneath a very weak lens, objects 
placed on the table beneath the mirror. For this purpose the stage is 
h 2 
