200 JNDEX. 



Lamella;, in walls of sclerenohymatous fibres, 41 ; in starch-grains, 102. 



Larix, as material for study of mitosis, 116. 



Latex, 86. 



Laticiferous vessels, 86, 87 ; -cells, 87. 



Leaf, Bifacial, 3, 30, 36, 37 ; Centric, 3, 37 ; Elaboration of food in, 18, 



167, 169, 177 ; Transpiration from, 28, 174, 175 ; Movements of, 181, 



185. 

 Leguminosse, Root tubercles in, 173. 

 Lenticles, Formation and function of, 39. 

 Leucoplasts, see Plastids. 

 Lichens, 88. 

 Light, Influence of, upon transpiration, 181 ; essential to formation of 



chlorophyll, 169 ; Action of chlorophyll upon, during photosynthesis, 



18, 167 ; influence of light of varying refrangibiUty upon metabolism, 



182 ; Influence of, upon growth, 181. 

 Lignin, 65. 



Lime tree, for examination of medullary rays, 74. 

 linin, see Nucleus. 

 Lower plants. Cells of, 88, et seq. 

 Lysigenous origin, in glands or canals, 83. 



M 



TVlAOROSPOKANGItTM, 121, 132, 144. 



IVlacrospore, Origin and structure of, in Angiosperms, 121 ; in Gymno- 



sperms, 132 ; in Heterosporous ferns, 144 ; Maturation stages in, 123, 



133, 144. 

 Magnesium, occurrence in plants, 157, 170 ; in aleurone-grains, 176. 

 Malic acid, in ferns, as a cause of chemotaxis, 143. 

 Mantle-fibres, see Mitosis. 

 Marsilea, see Heterosporoits ferns. 

 Mass-division of nucleus, see Amitosis. 



Maturation, of microspore, 121, 132, 144 ; of macrospore, 123, 133, 144. 

 Medulla, 45, 48, 77. 



Medullary rays. Primary, 72 ; Secondary, 73. 

 Medullary sheath, 77. 



Meristem, Apical, 43 ; Cambiums, 42, 48, et seq. ; Intercalary, 42. 

 Metabolism, 157. 

 Metaphase, see Mitosis. 

 Melosira, see Diatoms. 

 Micell*, 45. 



Microscope, Special observations with, 7, 13, 23, 90, 93, 97, 99, 101. 

 Microsomata, 15, 159. 

 Microsporangium, 121, 131, 144. 

 Microspore, Origin and structure of, in Angiosperms, 119; in Gymno- 



sperms, 131 ; in Heterosporous ferns, 144 ; Matuiation of, 121 132 



144. 

 Middle-lamella, 38, 43 ; in bordered-pits, 68. 



