1910] STOCKBERGER—TOXIC SOLUTIONS AND MITOSIS 407 
TABLE II 
AVERAGE GROWTH IN COPPER SULFATE SOLUTIONS AND DISTILLED WATER* 
COPPER SULFATE SOLUTION 
DIsTILLED WATER 
Concentration 
Time in solution 
in hours 
Growth in mm 
Growth of correspond- 
ing control in mm 
NS se i, ew, 
96,0008 265.5 
sy ke cate a 
BPS00,006. 2) 
Mi500,000.. 2 
bo 
> 
ou 
Non 
Noe 
oO 6 
000 
sel 
oo 
0. Oo) Ooo 
is} 
ae 
000 
0000 
S 
nu 
nao 
w oO 
A~nb ~AHMN ATOM 
ro 
oO 
ty Ying 
woe 
An 
nO 
7 
7-5 
Ls 
5 
10.2 
8.0 
11.6 
~ 
lanl 
ww “INI GO wo 
ty 
ons bt 
group ae pair ing 
The sum of these intervals will give the tota 
enw under each concentration represent consecutive grins = proces for a single 
1 ti 
THE EFFECT OF DILUTE SOLUTIONS OF COPPER SULFATE ON MITOSIS 
The material discussed in this section was selected from cultures 
in various concentrations of copper sulfate, and the root tips chosen 
for study, together with the corresponding control in distilled water, 
were fixed in the manner noted above at intervals of approximately 
twenty-four hours. Some preparations were made at other intervals 
in order to increase the range of observations. 
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