SEEDS AND GEEMINATION 



31 



glass. The Ions can be moved up and down and sidewise. This 

 outfit can be made for about seventy-five cents. Fig. D shows 

 a convenient hand-rest or uissecting-stand to be 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. 



^. — Dis- 

 secting 

 Needle 

 % natural 

 size. 



A— Dissecting Stand. 



C — Dissecting Glass. 



A. — 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. 



