10 INTRODUCTION [ch. i 



During storage, simple sugars, amino-acids, etc. have been condensed 

 to form insoluble, colloidal, or large molecules of starch, fats, aleurone, 

 cane-sugar, etc. These will remain until they are hydrolyzed by enzymes 

 when they can supply the growing shoots. Such stores are termed 

 " reserve materials." The actual stimuli involved in bringing about and 

 regulating this storage are unknown, but they are probably connected 

 with the life cycle of the particular plant under consideration and its 

 adaptation to external conditions. 



REFERENCES 



1. Abderhalden, E. Handbuch der biochemischen Arbeitsmethoden. Berlin, 

 1910. 



2. Abderhalden, B. Biochemisches Handlexikon. Berlin, 1911. 



3. Allen's Commercial Organic Analysis. London, 1909-1917. 



4. BertrandjG., and Thomas, P. Practical Biological Chemistry. Translated 

 by H. A. Colwell. London, 1920. 



5. Cole, S. W. Practical Physiological Chemistry. Cambridge, 1920. 6th ed. 



6. Czapek, P. Biochemie der Pflanzen. Jena, Bd. 1, 1913, Bd. 2, 1920, Bd. 3, 

 1921. 



7. Haas, P., and Hill, T. G. The Chemistry of Plant Products. London, 192L 

 3rd ed. 



8. Palladin, V. I. Plant Physiology. Edited by B. E Livingston. Philadelphia, 

 1918. 



9. Plimmer, R. H. A. Practical Organic and Biochemistry. London, 1918. 

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10. "Wehmer, 0. Die Pflanzenstoffe. Jena, 1911. 



11. Wester, D. H. Anleitung zur Darstellung phytochemischer Uebungs- 

 praparate. Berlin, 1913. 



