Reading glass, 4 illustration, 4 Reagent set, illustration, 39 Reagents, list of, 38 Research microscope, 13 illustration, 14 Reserve cellulose, illustrations of, 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, illustrations of, 213 crystals, illustrations of, 204 crystals, inclosed, illustrations of, 206 Ruellia ciliosa, Pursh., powdered, illustration of, 229 ciliosa, Pursh., rhizome, cross-section, illustration of, 225 ciliosa, Pursh., stem, cross-section, 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 Secretion cells, of klip buchu leaf, 262 of white pine, 248 Short paraffin process, 29 Sieve cells, of klip buchu leaf, 262 of pink root, 221 of ruellia rhizome, 226 of ruellia root, 223 of ruellia stem, 235 of spigelia stem, 235 Sieve plate, 138 illustration of, 137 Sieve tube, illustration of, 137 tubes, introduction, 136 tubes, structure, 136 Simple microscope, introduction, 3 Slide box, 48 box, illustration, 48 cabinet, 49 cabinet, illustration of, 49 forceps, 45 forceps, illustrations, 45 tray, 48 tray, illustration, 48 Solitary crystals, illustrations of, 207-209, 211, 212 unicellular hairs, 69 Special research microscope, 14 illustration, 14 Specimens, preservation of, 48 Spermoderm, of celery fruit, 288 of seeds, 289 Spigelia marylandica, powdered, illustration of, 228 rhizome, cross-section, illustration of, 224 root, cross-section, illustration of, 220 stem, cross-section, illustration of, 234 Spindle fibres, 55 Spiral vessels, illustrations of, 129, 130 Spongy parenchyma of klip buchu, 260 Stage micrometer, 19 illustration, 19 Staining dish, 40 illustration, 40 Standardization of ocular micrometer, 19 Starch grains, illustrations of, 186, 187, 189-193 Steinheil lens, 5 illustration, 5 Stems, diagnostic structures of, 233 dicotyledonous, 233 herbaceous, 233 monocotyledonous, 233 Stomata, ærating function of, 151 illustrations of cross-section, 156 relation to surrounding cells, 154 types of, 153