CONTENTS 



PAGE 



Historical 11 



Method of investigation 17 



Culture vessels 17 



Nutrient solution 18 



Action of solution on disaccharides 18 



Sterilization of seed 19 



Sterilization of media and culture vessels 19 



Sowing the seed '. 19 



Uniformity of seeds 19 



Rate of diffusion of carbon dioxide through cotton plugs 20 



Influence of certain sugars on growth of corn (Zea mays L.) -. 20 



In the Ught 21 



In the dark 22 



Influence of maltose on growth of corn embrj'o 23 



Experiments with Canada field pea (Pisum sativum L.) 24 



Experiments with timothy (Phleum pratense L.) 25 



Cultures in light 25 



Cultures in dark : 26 



Influence of lactose 27 



Influence of a mixture of lactose and saccharose 28 



Conclusion 28 



Experiments with radish (Raphanus sativus L.) 29 



Influence of approximately carbon-equivalent solutions 29 



Influence of equimolecular solutions of various sugars 32 



Experiments with winter vetch (Vicia \dUosa Roth.) 34 



Influence of certain disaccharides on growth 34 



Influence of various sugars on vetch grown in water cultiu-es 37 



Influence of equimolecular solutions of glucose, maltose, and saccharose 41 



Influence of glucose on root growth 43 



Influence of sugar on respiration and growth 43 



Influence of various concentrations of sugars on plant growth . 52 



Experiments with cabbage (Brassica oleracea L.) 52 



Experiment with sweet clover (Mehlotus alba Desr.) 54 



Experiment with crimson clover (TrifoHum incarnatum L.) 55 



Experiment with vetch 56 



Absorption of sugar from dilute solutions 57 



Toxicity of galactose for higher plants 59 



Secretion of enzymes by roots 61 



Influence of sugar on color production 62 



General discussion 63 



Summary 69 



Acknowledgments 70 



Bibhography 71 



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