SEEDS AND GERMINATION 31 



used under this lens. It may be 16 in. long, 4 in. high, and 4 or 5 

 in. broad. 



Various kinds of dissecting microscopes are on the market, and 

 these are to be recommended when they can be afforded. 



B. DIS- 

 SECTING 

 NEEDLE 



% natural 

 size. 



D. DISSECTING STAND. 



C. DISSECTING GLASS. 



^. IMPROVISED 

 STAND FOR LENS. 



Instructions for the use of the compound microscope, with 

 which some schools may be equipped, cannot be given in a brief 

 space ; the technique requires careful training. Such microscopes 

 are not needed unless the pupil studies cells and tissues. 



