Ill 



ASCENT OF SAP IN STEMS 



About 30 min. after the last observation, picric acid was 

 supplied to B, and forced through under a head of 41 5 cm. 

 of mercury. At the same time, water was forced through 

 A under a head of 44 cm. of mercury. After twenty- 

 five minutes when the picric acid had appeared in 

 quantity at the lower end of B, the head of 24 cm. of water 

 was restored to both. 



Table 9. 



It will be seen that the mean rate of transmission before 

 the high pressure was applied was 0'450 g. and 0*469 g. per 



c-600 



500 



5s, 



400 



S 



g-300 



c 



3-200 



<| -100 



11-7 



11-8" 



11-8" 



4 Time in hours 



12-4 Temp, of 

 jacket 



Fig. 15. 



10 min. for the control and experimental branches respec- 

 tively. During this time the average temperature was 11*8. 



