PLATE 78 MICRO-CRYSTALS 201 PLATE 79 RAPHIDES 203 PLATE 80 ROSETTE CRYSTALS 204 PLATE 81 INCLOSED ROSETTE CRYSTALS 206 PLATE 82 SOLITARY CRYSTAL 207 PLATE 83 SOLITARY CRYSTALS 208 PLATE 84 SOLITARY CRYSTALS 209 PLATE 85 SOLITARY CRYSTALS 211 PLATE 86 SOLITARY CRYSTALS 212 PLATE 87 ROSETTE CRYSTALS AND SOLITARY CRYSTALS OCCURRING IN 213 PLATE 88 CYSTOLITHS 214 PLATE 89 CROSS-SECTION OF ROOT OF SPIGELIA MARYLANDICA, L. 220 PLATE 90 RUELLIA ROOT (_Ruellia ciliosa_, Pursh.). 222 PLATE 91 CROSS-SECTION OF RHIZOME OF SPIGELIA MARYLANDICA, L. 224 PLATE 92 CROSS-SECTION OF RHIZOME OF RUELLIA CILIOSA, Pursh. 225 PLATE 93 POWDERED SPIGELIA MARYLANDICA, L. 228 PLATE 94 POWDERED RUELLIA CILIOSA, Pursh. 229 PLATE 95 CROSS-SECTION OF STEM OF SPIGELIA MARYLANDICA, L. 234 PLATE 96 CROSS-SECTION OF STEM OF RUELLIA CILIOSA, Pursh. 236 PLATE 97 POWDERED HOREHOUND (_Marrubium vulgare_, L). 238 PLATE 98 SPURIOUS HOREHOUND (_Marrubium peregrinum_, L.) 239 PLATE 99 POWDERED INSECT FLOWER STEMS (_Chrysanthemum cinerariifolium_, [Trev.], Vis.) 240 PLATE 100 CROSS-SECTION OF BUCHU STEMS (_Barosma betulina_ [Berg.], Barth, and Wendl.) 243 PLATE 101 BUCHU STEM and LEPTANDRA RHIZOME 244 PLATE 102 POWDERED BUCHU STEMS (_Barosma betulina_ [Berg.], Barth. and Wendl.). 246 PLATE 103 CROSS-SECTION OF UNROSSED WHITE PINE BARK (_Pinus strobus_, L.) 249 PLATE 104 POWDERED WHITE PINE BARK (_Pinus strobus_, L.) 251 PLATE 105 CROSS-SECTION OF QUASSIA WOOD (_Picræna excelsa_ [Sw.], Lindl.) 255 PLATE 106 TANGENTIAL SECTION OF QUASSIA WOOD (_Picræna excelsa_ [Sw.], Lindl.) 256 PLATE 107 RADIAL SECTION OF QUASSIA WOOD (_Picræna excelsa_ [Sw.], Lindl.) 257 PLATE 108 CROSS-SECTION OF KLIP BUCHU JUST OVER THE VEIN 261 PLATE 109 POWDERED KLIP BUCHU 263 PLATE 110 CROSS-SECTION MOUNTAIN LAUREL (_Kalmia latifolia_, L.) 265 PLATE 111 CROSS-SECTION TRAILING ARBUTUS LEAF (_Epigæa repens_, L.) 266