POWDERED DRUGS AND FOODS. 759 



121. JUNIPERUS. Calcium oxalate in monoclinic prisms 

 about 30 fi in diameter, occurring in stone cells, which are about 

 60 fi in diameter and with walls that are about 15 /u, in thickness; 

 a small number of nearly spherical starch grains from 5 to 7 yu, in 

 diameter; fragments with oil glands and brown pigment cells. 



y Crystal Fibers Present 



I. Sclerenchymatous Fibers Strongly Lignified. 



* Colored Reddish With Alkalies. 



122. FRANGULA. (See No. 52.) 



123. RHAMNUS PURSHIANA. Light brown (Figs. 229, 

 A; 304); bast libers long, much thickened, lignified; stone cells 

 very thick-walled, about 50 fx. in diameter ; crystal fibers contain- 

 ing monoclinic crystals of calcium oxalate ; calcium oxalate also 

 in rosette aggregates or monoclinic prisms 5 to 20 ^ in diameter ; 

 starch grains spherical, about 4 fj. in diameter; parenchymatous 

 cells with yellowish contents colored red with alkalies. 



** Not Colored Reddish With Alkalies. 



124. QUERCUS ALBA. (See No. 182.) 



125. PRUNUS VIRGINIANA. Light brown; bast fibers 

 and stone cells with much thickened and strongly lignified walls ; 

 crystal fibers containing monoclinic prisms and rosette aggregates 

 of calcium oxalate 20 to 30 /x in diameter; starch grains nearly 

 spherical, 3 to 4 /x in diameter. 



126. MYRICA CERIFERA. Greenish-brown (p. 250) ; 

 crystals in rosette aggregates about 45 /x in diameter, or in mono- 

 clinic prisms from 15 to 20 ^ in diameter ; crystal fibers, accom- 

 panying long bast fibers, the latter being 100 /x in diameter and 

 with walls about 25 /x in thickness ; starch grains about 7 fx in 

 diameter, also occurring in 2- to 4-compound grains. 



127. PULVIS GLYCYRRHIZ.F: COAIPOSITUS. Tissues 

 of glycyrrhiza (Figs. 104; 204; 282, B) and senna (Figs. 263; 

 284, D) ; granules of sulphur (see No. 94) ; crystals of sugar, 

 and masses of manna. 



