DAILY RHYTHMS IN CERTAIN ROOTS 
407 
EXPLANATION OF PLATES XXIV AND XXV 
Ordinates in curves I-IV show rate of elongation in mm. per hour; in curves V-IX 
they show the number of cells per sq. mm. undergoing mitosis. The abscissae show time 
of day by the clock. 
I 
(Base line = o. Scale, i square = .08 mm.) 
193. ( ) Elongation of Pisum sativum. Germination at 9 A.M. 
194. ( ) " " " " " " " 
160. ( ) " " " " " " 6 P.M. 
174. ( ) " " " " " " 8 P.M. 
102. ( — • — ) " " Zea everta. 
II 
(Base line = o. Scale, i square — .08 mm.) 
70. ( ) Elongation of Lupinus alhus. Germination at 9 A.M. 
73- (- ) " " " " " " " 
272. ( ) " *' Allium Cepa (bulb) " " " 
296. (- • - ) " " " " " " " " 
III 
(Base line = o. Scale, i square = o.i mm.) 
275. ( ) Elongation of Allium Cepa (seed). Germination at 9 A.M. 
276. ( ) " " " " " " " " 
288. ( ) " " " " " " " " 
111. ( — • — ) " " Cucurbita Pepo " " " 
112. ( ) " " " " " " " 
IV 
(Base line = o. Scale, i square = .08 mm.) 
273- ( ) Elongation of Allium Cepa (seed). Germination at 9 A.M. 
274- ( ) " " " 
281. ( ) " « " " " " " " 
283. ( ) " " " " " " " " 
V 
(Base line - 125. Scale, i square — 10 cells.) 
2. ( ) Mitosis in Pisum sativum (wrinkled) Germination 9 A.M. 
27. ( ) " " " " (smooth) 
28. ( ) " " " " " " 2 P.M. 
31. ( ) " " " " " " 8 " 
VI 
(Base line = 125. Scale, i square = 15 cells) 
33. ( ) Mitosis in Pisum (smooth). From refrigerator at 9 A.M. 
35- ( ) " " " " . " " " I P.M. 
7. ( ) " " Zea everta. Germination at 9 A.M. 
VII 
(Base line = o. Scale, i square = 5 cells.) 
I. ( ) Mitosis in Lupinus albus. Germination at 9 A.M. 
13. ( ) " " " " " " " 
VIII 
(Base line = 50. Scale, i square = 10 cells.) 
10. ( ) Mitosis in Allium Cepa (bulb). Germination at 9 A.M. 
24. ( ) " " . " . . " " " 
5- ( ) " " Vicia faba. Germination at 9 A.M. 
IX 
(Base line = 300. Scale, i square = 10.) 
12. ( ) Mitosis in Allium Cepa (seed). Germination 9 A.M. 
22. ( — ) " " Allium canadense " " 
23. ( ) " " Allium cernuum " " 
