INDEX 
Periderm, 80 
cork, 80 
illustrations of, 86 
of cascara sagrada, illustrations, 
84 
of white oak bark, illustration 
of, 87 
parenchyma and stone cells, 85 
stone cells, 85 
Permanent mounts, 41 
Pharmacognostic microscope, 
tration, 12 
Phloem, centric bundle of calamus, 
cross-section, illustration of, 
294 
of ruellia rhizome, 226 
of ruellia stem, 235 
of spigelia rhizome, 223 
of spigelia stem, 233 
Phloem parenchyma, conduction by, 
150 
of pink root, 221 
of ruellia rhizome, 226 
of ruellia root, 223 
of ruellia stem, 235 
of spigelia rhizome, 223 
of spigelia stem, 235 
Photosynthetic tissue, 163 
Pink root, description of, 227 
Pith parenchyma, conduction by, 
147 
of pink root, 221 
of ruellia rhizome, 227 
of ruellia root, 223 
of ruellia stem, 237 
of spigelia rhizome, 226 
of spigelia stem, 235 
Pitted vessels, with bordered pores, 
illustration of, 135 
illustrations of, 134 
Plant hairs, forms of, 67 
introduction, 66 
Polar caps, 55 
Polarization microscope, 16 
illustration, 16 
Pollen grains, 270 
non-spiny-walled, description of, 
273 
smooth-walled, illustrations of, 
271 
spiny-walled, description of, 273 
spiny-walled, illustrations of, 272 
illus- 
303 
Preparation of specimens for cutting, 
28 
Protoplast, 53 
Quassia wood, cross-section, illustra- 
tion of, 255 
radial-section, illustration of, 257 
Radial vascular bundles, 292 
skunk cabbage root, cross-sec- 
tion, illustration of, 293 
Raphides, illustrations of, 203 
Reading glass, 4 
illustration, 4 
Reagent set, illustration, 39 
Reagents, list of, 38 
Research microscope, 13 
illustration, 14 
Reserve cellulose, 
180-181 
Reticulate vessels, illustrations of, 133 
Root hairs, 121, 122, 125 
illustration of, 123 
illustration of fragments, 124 
Roots and rhizomes, 219 
diagnostic structures of, 227 
Rosette and solitary crystals, illus- 
trations of, 213 
crystals, illustrations of, 204 
crystals, inclosed, illustrations of, 
206 
Ruellia ciliosa, Pursh., 
illustration of, 229 
ciliosa, Pursh., rhizome, cross- 
section, illustration of, 225 
ciliosa, Pursh., stem, cross-sec- 
tion, illustration of, 236 
root, description of, 227 
root, illustration of, 222 
Scalpels, 46 
illustration, 47 
Scissors, 46 
illustration, 46 
Sclariform vessels, illustrations of, 
132 
Seeds, parts of, 289 
Secretion cavities, of celery fruit, 288 
description of, 176 
illustrations of, 169-171 
introduction, 166 
lysigenous, 168 
schizogenous, 168 
schizo-lysigenous, 168 
unicellular, 168 
illustrations of, 
powdered, 
