798 



BOTANY AND PHARMACOGNOSY. 



264. CALCII PHOSPHAS PR^CIPITATUS. In glycerin 

 mount alone small tetragonal and cubical crystals are observed. 



Fig. 322. Larger grains of various starches as viewed through the micropolariscope 

 when mounted in oil: A, potato (70-80 fi); B, wheat (30-40 m); C, ginger (30-50 fj.); D, 

 galangal (45-55 >i); E, calumba (40-60 fi); F, zedoary (50-75 n); G, maranta (35-50 fi); 

 H, colchicum (10-20 (i); I, com (20-25 m); J. cassava (20-35^ )", K, orris root (30-35 n) 



If to a few milligrams of the powder on a slide a f^ew drops of 

 nitric acid are added, and then a small quantity of ammonium 



