Method of mounting specimens, 41 Micro-crystals, illustrations of, 201 lamp, 27 Micrometer eye-pieces, 21 illustrations, 20, 21 Microphotographic apparatus, 24 illustration, 24 Microscope, how to use, 25 Microscopic measurements, 19 Microtome, care of, 36 Middle bark of white pine, 248 lamella, 55 layers of seeds, 291 Minor rotary microtome, 36 illustration, 36 Mountain laurel, cross-section, illustration of, 265 Mucilage cavities, 172, 176 Multicellular hair, 72 Nuclear membrane, 55 spindle, 55 Nucleoli, 55 Nucleus, 53 Objectives, illustrations, 11 Ocular micrometer, 19 illustration, 19 Oil cavities, occurrence, 178 of leaves, 178 of seeds, 178 unicellular, 172 Open collateral vascular bundles, description of, 298 Origin of multicellular plants, 57 Outer bark of white pine, 248 Palisade parenchyma, conduction by, 150 Papillæ, 67 illustrations of, 275 of stigmas, illustrations of, 276, 277 stigma, description of, 274 Paraffin, blocks, 31 embedding oven, illustration, 30 Parenchyma, aquatic plant, 150 cells of white pine, 248 conduction by, 144 cortical, illustrations of, 148 of mountain laurel, 264 of trailing arbutus, 264 pith, illustrations of, 149 Pericycle of pink root, 221 of ruellia root, 223 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, illustration, 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 Preparation of specimens for cutting, 28 Protoplast, 53 Quassia wood, cross-section, illustration of, 255 radial-section, illustration of, 257 Radial vascular bundles, 292 skunk cabbage root, cross-section, illustration of, 293 Raphides, illustrations of, 203