80 BOTANICAL GAZETTE [jcxy 



6. The rate of respiration of the convex side of the geo tropically 

 stimulated shoot is greater than that of the concave side throughout 

 the period of perception and response. 



7. Respiration decreases as the time of stimulation increases. 



8. The steps, in point of time, of the chemical changes that 

 take place in a geotropically stimulated shoot are: (1) increased 

 respiration, (2) increased acidity (18), (3) increased turgor, and 

 (4) increased production of hydrolyzable sugars with corresponding 

 decrease of polysaccharides on the convex side of the responding 

 organ. 



The writer is greatly indebted to Dr. William Crocker, 

 who suggested the problem, and who gave much assistance during 

 the progress of the work; to Dr. F. C. Koch for help in the methods 

 of analysis; and to Dr. Shiro Tashiro for assistance in the work 

 on respiration. 



LITERATURE CITED 



1. Buchner, H., Anatomische Veranderung bei gewaltsamer Krummung und 

 Geotropic Induction. Jahrb. Wiss. Bot. 42:271-360. 1906. 



2. Cielsielski, Theo, Untersuchungen iiber die Abwartskriimmung der 

 Wurzel. Cohn, Beitrage zur Biologie der Pflanzen 2: 1872. 



3. Copeland, E. B., Studies on the geotropism of stems. Bot. Gaz. 29: 195. 

 1900. 



4. Czapek, Fr., The anti-ferment reaction in tropistic movements of plants. 

 Ann. Botany 19:361-457. 1906; same paper in Oxydative Stoffwechsel- 

 vorgange bei pflanzlichen Reizreaktionen. Jahrb. Wiss. Bot. 93:361-457- 

 1906. 



5. DeVries, Hugo, liber die Aufrichtung des gelagerten Getreides. Land- 

 wirtschaftliche Jahrb iicher 9:473-520. 1880. 



6. Eckerson, Sophia, Thermotropism of roots. Bot. Gaz. 58:254-263. 



1914. 



7. Elfving, Fr., Zur Kenntnis der Krummungserscheinungen der Pflanzen. 

 Sartrych. Ofver. Finska Vet. Soc. Forhandl. 30: (review, Justs' Bot. 

 Jahrsb. 16:93. 1888). 



8. Georgevitch, P. M., Cytolische Studien an den geotropische gereizten 

 Wurzeln von Lupinus albus. Beih. Bot. Centralbl. 22: 1-20. 1907. 



9. Grafe, V., and Linsbauer, K., Kenntnis der Stoffwechselvorgange bei 

 geotropischer Reizung. 2. Mitteil. Sitz. Wiss. Akad. Wiss. Math. Nat. 

 119:827-852. 1910. 



