8o4 



BOTANY AND PHARMACOGNOSY. 



to decomposition, may, however, be kept for months or even years 

 by preparing them with care and keeping them in a special kind 

 of bottle (Fig. 323). An ordinary bottle may be used, and is 

 fitted with a rubber stopper perforated so as to allow the intro- 

 duction of two glass tubes. These tubes are bent twice at right 



I 



Fig. 324. Method of applying reagent to material already mounted, g, pipette; f, 



filter paper. 



angles and the free ends directed downwards. One of the tubes 

 is connected with an atomizer bulb and serves for forcing out the 

 liquid. A small plug of absorbent cotton is placed in the tube 

 at the point C, so as to filter the air. This may be improved by 

 blowing a bulb in the tube for holding the cotton. The bottle 

 should be sterilized before placing the solution in it, and the solu- 

 tion should be made by adding the dye to sterile water contained 



