1921] MEIER—ROOT TIP 127 
exhibition of loss of turgidity, by showing little resistance to flat- 
tening by gentle pressure (being drawn between thumb and fore- 
finger) was regarded as evidence that this portion of the root was 
TABLE III 
CURRENT 0.4 MILLIAMPERE, 100 VOLTS; CRITICAL TIME 90 SECONDS 
..: | Timeof |, Average Dead 
Lot number | dfvoots | er o"| exposure fos. ( ho Sumber | Revd | above and 
used current sameag length | curvature only alec 
ee Ra oe res 6 i 30 +1.1 4 6 ° 
ss an 6 iN 35 +2.0 5 6 ° 
Be ee 5 uy 40 +-1.4 3 5 ° 
EES CR ee rae 8 » 45 +o.8 5 8 ° 
Be ee ec 6 Vv 50 +1.5 3 6 ° 
es ick: 6 4 ke —o.I 2 5 I 
Wie 6 v 60 —0.5 2 4 2 
ne EE ESDP I2 v 65 =—o.5 7 9 3 
tf | ee eee 12 s 70 —0.5 6 8 4 
2 ae seer 6 v 70 —0.3 5 5 I 
sy ea Gene tee 6 uN 75 —0.5 4 6 re) 
ya | ena Bi ee 13 \ 80 —0.0 5 8 5 
ee 10 uN 85 —0.6 2 3 7 
sy ey Gee emt Io Vv 90 —1I.0 ° ° Io 
10, 04, 96)... 21 4 90 —0.7 2 2 19 
TABLE IV 
CURRENT 0.3 MILLIAMPERE, 90 VOLTS; CRITICAL TIME 2 MINUTES, 30 SECONDS 
Average 
as Time of a vee ead Dead 
Lot number aan of | exposure as cy pa above ee ag 
; used current aii in length | curvature only 
_— in mm. 
Re eee 6 ‘ gO. | EES 3 6 . 
Pee oe tee 6 120 | 0.5 2 * f 
Rees Gee 6 120 Org 4 5 ‘ 
0. 16 nN 135 —0.5 ° 6 ro 
ee 7 \ 155°} 8-7 2 3 4 
Le Lk Bog ee 5 4 140 —o.6 I I 4 
ne se ences 28 150. | —0.7 ° ° 28 
WO eis: 10 \ 150 —1.0 ° ° = 
a at, CUS epee 18 165 —0.9 ° ° 18 
dead. When, however, the appearance of the extreme tip was watery 
instead of chalky white and exhibited distinct turgidity, it was 
regarded as evidence that the cells were in a living condition. 
Associated with the latter condition was an increase in length and 
