ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



501 



■which can be shaded by a rising lid. The stage is attached to a piece 

 of tubing fitting over the objective, and the objects can be illuminated 

 either by direct light or by a mirror sliding in the socket below the 

 stage. A lieberkiihn fits over the objective for opaque objects. 



Fig. 86. 



Coohe's Projection Microscope. — The disadvantage of the preceding 

 instrument is the small size of the image, an objection which is 

 remedied in the form devised by Mr. C. Cooke and shown in fig. 87. 



Here the stage is raised on four legs to a height of 18 in. above 

 the table. One of the legs has an arrangement for lengthening or 

 shortening it, by screwing in or out a separate piece at the foot. The 

 objective is screwed to an adapter which slides in a tube-fitting beneath 

 the stage. A mirror is attached to a gimbal sliding on a vertical rod 

 above the stage, on which is also a socket for other apparatus. The 

 rod is connected with a ring which rotates on the outer margin of the 

 stage, carrying with it a clip with a lamp. The clip is made to grasp 



