8o BOTANICAL GAZETTE [july 



6. The rate of respiration of the convex side of the geotropically 

 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 



1 



organ. 



The writer is greatly indebted to Dr. William Crocker, 



&6 



problem, and who gave much 



Koch for helo in the m 



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 uber die Abwartskriimmung der 

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



3. Copeland, E. B., Studies on the geotropism of stems. Box. 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, ttber die Aufrichtung des gelagerten Getreides. Land- 

 wirtschaftliche Jahrb ucher 9:473-520. 1880. 



6. Eckerson, Sophia, Thermotropism of roots. Box. 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 S toff wechselvorgange bei 

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

 119:827-852. 1910. 



