POWDERED DRUGS AND FOODS. 705 



A. Containing starch. — Continued. 



b. Calcium oxalate wanting. 

 o Stone cells present. 



Characteristic starch grains '.60. Calumba 



/3 Stone cells wanting. 



1. Starch grains 15 to 30 /* in diameter. 



With yellow oil-secretion cells 61. Zingiber 



2. Starch grains s to 15 /» in diameter. 



Long non-Iignified bast fibers 62. Mezereum 



Ducts large 63. Pareira 



Lignified sclerenchymatous fibers. .64. Serpentaria 

 Powder lemon-yellow 65. Berberis 



3. Starch grains less than S ;» in diameter. 



Crystals of alkaloids with sulphuric acid. 



66. Hydrastis 



4. Starch grains altered. 



Large cells with swollen grains 67. Curcuma 



B. Starch grains few or none. 



a. Calcium oxalate crystals present. 



" In rosette aggregates. 



Non-glandular hairs 68. Anisum 



Oil-like globules in epidermis 69. Calendula 



Non-glandular hairs wanting 70. Fceniculum 



/3 In monoclinic prisms. 



Crystals 15 to 20 1" 71. Aurantii Amari Cortex 



Crystals 20 to 30 /" 72. Aurantii Dulcis Cortex 



7 In raphides. 



Crystals o.i to I mm. long 73. Scilla 



b. Calcium oxalate crystals wanting. 



a Sclerenchymatous cells or fibers present. 



1. Dark pigment cells wanting. 



Stone cells with thickened inner walls. 



74. Sinapis alba 

 Stone cells ellipsoidal, uniformly thickened. 



75. Pepo 

 Parenchyma cells large, thin-walled. 



76. Colocynthis 



2. Pigment cells present. 



Stone cells with thickened inner walls. 



77. Sinapis Nigra 

 Characteristic sclerenchymatous cells and fibers. 



78. Fenugreek 



45 



