POWDERED DRUGS AND FOODS. 705 



A. Containing starch. Continued. 



b. Calcium oxalate zvanting. 

 a. Stone cells present. 



Characteristic starch grains 60. Calumba 



^ Stone cells wanting. 



1. Starch grains 15 to 30 M in diameter. 



With yellow oil-secretion cells 61. Zingiber 



2. Starch grains 5 to 15 /" in diameter. 



Long non-lignified bast fibers 62. Mezereum 



Ducts large 63. Pareira 



Lignified sclerenchymatous fibers. .64. Serpentaria 

 Powder lemon-yellow 65. Berberis 



3. Starch grains less than S M 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. 



a In rosette aggregates. 



Non-glandular hairs 68. Anisum 



Oil-like globules in epidermis 69. Calendula 



Non-glandular hairs wanting 70. Fceniculum 



/S In monoclinic prisms. 



Crystals 15 to 20 M 71. Aurantii Amari Cortey. 



Crystals 20 to 30 M 72. Aurantii Dulcis Cortex 



7 In raphides. 



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



b. Calcium oxalate crystals icanting. 



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 



