48 



FUNCTIONS OF LIVING THINGS 



2. NOTE. — The stand consists of the following parts: base (A), pillar (B), 

 stage (M), arm (C), tube (D), diaphragm (S), mirror (O), revolving nose piece (E), 

 the coarse (K) and the fine (L) adjustment. 



Of what material is the stand made? What are the advantages of using such 

 material ? 



3. NOTE. — The stand rests upon a broad base or foot. 



What is the shape of the base? Why should the base be broad and 

 heavy ? 



