128 



SELECTION AND 



the better illumination of the ob- 

 ject, and will be described in the 

 section on "Light;" others are used 

 for the procuring and preparation 

 of objects, and will be described in 

 the section devoted to tbet subject. 

 The following are employed chiefly 

 for holding and presenting objects 

 that have not been " mounted:" 



Stage Forceps. This little in- 

 strument accompanies the oldest 

 microscopes. It consists of a pair 

 of very delicate forceps, such as 

 those attached to the forceps-car-, 

 rier in Fig. 27, which close by the 

 spring of the jaws, and hold any ob- 

 ject that may be placed in their 

 grasp. They are opened by pressing 

 on the pins which are seen at the 

 sides. They are in general fastened 

 to tne microscope by being stuck 

 into a hole in the stage, and the 

 object may not only be moved back- 

 ward and forward, but it can be 

 turned round. The better class of 

 'forceps carry a small /brass tube 

 (shown in Fig. 27) which is filled 

 with cork, and which serves to re-' 

 ceive pins, etc., for holding insects, 

 and other objects. 



Foi ceps-Carrier. However 

 we-1 made the forceps may be, it is 

 almost impossible to slide, with suf- 

 ficient delicacy, the rod through the 

 tube that holds it. Consequently, 

 it is exceedingly difficult to bring 

 into the field of view, the exact part 

 of the object, that we may wish to 



