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. 



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. 



