Turgor and of Temperature on Growth. 389 
making during this time an average growth of 0-7 mm. per 
24 hours. They were quickly transferred to a temperature of 
23 0 C., and the further growth measured at suitable intervals. 
As one showed abnormal symptoms, the following table shows 
averages drawn from but three specimens. 
The feature here to be noted is the long period of retarded 
growth following the change to the higher temperature. The 
roots seem during the exposure to the cold to have gone Into 
TABLE XIII. 
Period. 
Growth per hr. 
Temperature. 
Hours. Min. 
3 30 
0*28 mm. 
2 4 .2°C. 
2 45 
0*24 „ 
23*6 „ 
16 
45 
0-27 „ 
22-4 „ 
2 4 
00 
0-03 „ 
23*5 » 
23 
30 
o-37 » 
23*6 „ 
24 
30 
1.06 „ 
23-6 „ 
0 
0 
CJ 
0.90 „ 
23*9 >, 
48 
30 
0.69 „ 
23*8 » 
24 
00 
0.60 „ 
23*8 >> 
23 
30 
o -37 „ 
23-9 „ 
a state of torpor, from which an awakening to full activity 
iqkes place but slowly. The course of the growth-curve 
seems to be permanently affected. The maximum lies lower 
than is normally the case in this temperature, and the de- 
scending limb falls more abruptly than in the normal curve. 
Unless a correlative change, giving a longer-growth period 
than usual, takes place, the total growth here suffers a 
diminution. 
Table XIV gives the average growth-rates of four roots of 
Vicia Faba during and after a stay of 48 hours In a tempera- 
ture varying between 2-5° and 6-o° C. 
The period of retarded growth here seen to follow the tem- 
perature-change is very much less marked than in Table XIII, 
