PAPAVER 



265 



Powder. Grayish-yellow; fragments of the epicarp composed 

 of thick-walled polygonal cells, the cells of the outer layer, non-porous, 

 about 0.050 mm. in diameter and with occasional stomata, the latter 

 attaining a length of 0.035 mm.; the cells of the inner layer of the 

 epicarp often with numerous simple pores; portions of the soft 

 spongy sarcocarp consisting of isodiametric or irregular parenchyma 

 cells and branching latex tubes, the latter about 0.060 mm. in width 

 of variable length and with thin non-porous walls; fragments of the 



-i. 



FIG. 119. Poppy Capsules grown in the gardens of the Pharmaceutical Institute 

 of the University of Berlin in Dahlem, Germany. Two of the capsules 

 grown from white seeds and showing the transverse incisions from which 

 the milk juice exudes, forming irregular globular masses on the surface of 

 the capsules. Thorns, Ber. d. d. pharm. Ges., 1907, p. 31. 



inner wall of the pericarp and the outer wall of the placental tissue 

 composed of polygonal or somewhat elongated cells, with porous 

 walls 0.060 mm. in width, and attaining a length of 0.300 mm., the 

 walls of the latter cells are often slightly lignified ; spiral 'and annular 

 tracheae 0.35 mm. in width, and reticulate tracheae 0.060 mm. in width; 

 sclerenchymatous fibers and cells with simple or oblique pores few; 

 starch grains very few, small and somewhat rounded; fragments 

 of the reticulately pitted seed coat very few or wanting. Newcomb. 



