THE SIMPLE MICROSCOPE 9 



scopes than that illustrated in Fig. 3 are obtainable 

 in some variety of forms from various makers. 

 Messrs. Watson supply one (see Fig. 4) at the low 

 price of 5s. This has a simple metal base, 4 inches 

 by 3^ inches, on which a piece of matt opal glass, 

 2| inches by 2f mches, fits in grooves. The arm for 

 holding the magnifier shdes on the upright cylindrical 

 rod. The price mentioned is for the stand only ; a 

 single magnifier of about 9-diameter power is sup- 

 plied for this instrument for an extra 2s. 6d. 



Fig. 4. — Cheaper Foem of Dissecting Miceoscope. 



The worker requires a few dissecting tools. Com- 

 plete sets vary in cost from half a guinea to over a 

 sovereign. A scalpel, a pair of scissors, a pair of 

 forceps, and three or four needles set in handles, 

 are really necessary. The begumer who has to study 

 cost may be able to make a sharp pocket-knife do 

 in place of the scalpel, which costs at least Is. 6d. 

 The scissors, to be good, wUl cost 2s. 6d. The for- 

 ceps supplied with cheap compound microscopes 



