302 



IJTOEX 



Labeling, 47 

 Latex cavities, 176 



tube cavities, 176 



tubes, 142, 144 



tubes, illustration of, 145 



vessels, illustrations of, 146 

 Leaf epidermis, 59 



illustrations, 60, 61 

 Leaf parenchyma, conduction by, 150 

 Leaves, diagnostic structures of, 267 



stomata, 260 

 Lenticel, illustration of cross-section, 



159 

 Lenticels, aerating function of, 157 



structure of, 158 

 Linin, 54 



Long paraffin process, 29 

 Machine microtomes, 32 

 Measuring cylinder, 40 



illustration, 40 

 Mechanical stage, 21 



stage, illustration, 22 

 tissue, 89 

 Medullary ray, 139 

 bundle, 139 

 bundle in tangential-section of 



quassia wood, 258 

 cell, 141 

 cell, arrangement of, in the ray, 



142 

 cell, structure of, 142 

 cells, in cross-section of quassia 



wood, 254 

 cells, in radial-section of quassia 



wood, 258 

 cells, in tangential-section of 



quassia wood, 258 

 cells, of ruellia stem, 237 

 Medullary rays, illustration of cross- 

 sections of, 143 

 illustration of longitudinal sec- 

 tion, 140 

 in cross-section of quassia wood, 



254 

 in radial-section of quassia wood, 



254 

 of pink root, 221 

 of ruellia rhizome, 227 

 of ruellia root, 223 

 of spigelia rhizome, 226 

 of white pine bark, 250 

 Mesocarp of celery fruit, 285 



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, illus- 

 tration 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, de- 

 scription of, 298 

 Origin of multicellular plants, 57 

 Outer bark of white pine, 248 

 Palisade parenchyma, conduction by, 



150 

 Papillae, 67 



illustrations of, 275 



of stigmas, illustrations of, 276, 



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 



