n^ 



BOTANY AND PHARMACOGNOSY. 



POWDERS OF A YELLOWISH COLOR. 



In this group are included all those powdered drugs which are 

 of a light yellow (light yellow ochre), dark yellow (dark yellow 

 ochre), lemon-yellow, bright yellow (luminous yellow) or yellow- 

 ish-brown color. Representatives of all the different kinds of 

 drugs are found in this group. 



I. FRAGMENTS OF VEGETABLE TISSUE PRESENT. 

 A. CONTAINING STARCH. 



fr 



a 



Fig. 288. Jalap: pr, parenchyma containing unaltered starch grains; pr', paren- 

 chyma containing swollen starch grains; a, starch grains; K, rosette aggregates of calcium 

 oxalate; m, globular mass of resin; sp, fragment of trachea with bordered pores. After 

 Vogl. 



a. CALCIUM OXALATE PRESENT. 



a In Rosette Aggregates. 



46. FRANGULA. (See No. 52.) 



47. GALEA (ALEPPO). Dark yellow crystals lO/*; starch 

 grains 10 fx. in diameter, single or sometimes in groups; stone 

 cells ; tannin ; crystals of gallic acid. Chinese or Japanese Galls. 

 Grayish-green ; crystals few, about 20 /x in diameter ; starch grains 

 about 40 fi in diameter; non-glandular hairs; milk vessels accom- 

 panying ducts. The mounts in glycerin show acicular crystals 

 of gallic acid. 



