REVIEW ON FLOWERS 



127 



lens may be mounted on a wire in a block, as in Fig. 198. A cork is 

 slipped on the top of the wire to avoid injury to the face. The pupil 

 should be provided with two dissecting needles (Fig. 199), made by 

 securing an ordinary needle in a 

 pencil-like stick. Another con- 

 venient arrangement is shown in 

 Fig. 200. A small tin dish is used 

 for the base. Into this a stiff wire 

 standard is soldered. The dish is 

 filled with solder, to make it heavy 

 and firm. Into a cork slipped on 

 the standard, a cross- wire is in- 

 serted, holding on the end a 

 jeweler's glass. The lens can be moved up and down and sidewise. 

 This outfit can be made for about seventy-five cents. Fig. 201 shows 

 a convenient hand-rest or dissecting 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. 



201. Dissecting stand. 



Odd blossom of one of the passion-flowers. 



Calyx-lobes and petals are 5. A fringe of hairs (or crown) grows from 

 the petals. The club-shaped stigmas project. The stamens, 5 in number, 

 stand inside the crown. 



