376 



INDEX 



Lepeschkin, on protoplasmic mem- 

 brane, 118 



on root pressure, 140-141 

 Leucoplasts, 17, 18 

 Liebig, on law of the minimum, 85 



on law of return, 90 

 Life cycle, of higher plants, 342-c45 

 Light, absorption by leaves, 31 



assimilation in photosynthesis, 33 



coefficient of utilization, 31-32 



importance of, in assimilation, 25- 

 26 



plants, 39 



probe, 321 

 Linnaeus, on "floral clock," 336 

 Lipase, 216 

 Lipoids, 71, 215-219 

 Livingston, on transpiration, 158, 



171 

 Lloyd, on stomata, 167 

 Loeb, on balanced solutions, 76 



on poisonous effect of single salts, 

 75 



on root-forming hormones, 362 

 Loftfield, on stomata, 169 

 Lubimenko, on assimilation rate, 33 

 Lundegardh, on carbon dioxide lib- 

 eration by soil, 44-45 



M 



MacDougal, on dendrograph, 191— 



192 

 Magnesium, role in metabolism of, 73 

 Maltase, 209 

 Maltose, 208-209 

 Mase, on root secretions, 79 

 Matthaei, on assimilation, 47 

 Maximov and Alex and rov, on 

 transpiration, 178 



on artificial light for plant growth, 

 42 



on drouth resistance, 179 

 Melin, on mycorrhizae, 243 

 Membranes, precipitation, 110 



semipermeable, 110-111 

 Mesophytes, 173-177 

 Micellae, 104, 105 



Microorganisms, sanrophytic, 232- 



233 

 Mimosa, 339-340 



Mineral elements, absorption of, 66- 

 98 



indispensable, 66-67 



in plant ash, 66-68 



use by various plants, 88-91 

 Mineral fertilizers, 84-85 

 Mineral nutrition, 76-80 

 Minor elements, role in metabolism 



of, 74 

 Mistletoe, 239 

 Mitscherlich's law of action of growth 



factors, 85-88 

 Miyoshi, on chemotropism, 330 

 Molisch, on forcing, 291, 292 



on seed germination, 295-296 



on stomata, 167 

 Movements of plants, 312-341 



alternating, 314 



diurnal, of stomata, 169 



mechanisms of, 312-314 



nyctinastic, 366-341 



seismonastic, 336-341 



twining, climbing, 333-335 

 Mycorrhiza, 242-243 



N 

 Nadson, on calcium oxalate, 219 

 Naegeli, on micellae, 104 

 Neljubov, on sensitivity to ethylene, 



329 

 Nemec, on geotropism, 327 

 Neubauer, on soil fertility, 84 

 Neuberg, on alcoholic fermentation, 



263 

 Nitrate accumulating plants, 92 

 Nitrates, as source of nitrogen, 54-55 

 Nitrification, 255-258 

 Nitrogen, absorption, 50-65 

 from soil, 51-53 

 assimilation, atmospheric, by soil 

 bacteria, 56-59 

 by legumes, 59-63 

 role of light in, 55-56 

 cycle in nature, 63-65 

 fertilizers, 63-65 



