500  The  Germination  of  Belladonna  Seed.  {^ovemberfilS1' 
as  100  per  cent.  The  weaker  solutions  designated  as  80,  60,  40,  and 
20  per  cent,  in  the  tabulations  were  made  by  diluting  the  commercial 
material  on  the  basis  of  100  per  cent.  A  small  lot  of  the  seeds  was 
treated  with  the  various  solutions  of  peroxide  for  18  hours.  The 
treatment  was  duplicated  with  another  lot  of  seeds  for  24  hours  and 
with  still  another  lot  for  48  hours.  All  seeds  were  immediately  dried 
after  the  removal  of  the  peroxide  in  a  Gooch  crucible.  One  hundred 
seeds  of  each  lot  were  planted  on  February  16th  and  the  germination 
noted  from  time  to  time.  Table  XIV  shows  the  percentage  of  ger- 
mination in  each  case  up  to  April  9th,  when  the  germination  appeared 
to  be  completed. 
Table  XIV. 
Comparative  Germination  of  Seeds  Treated  with  Hydrogen  Peroxide  and  Sown  ' 
February  16th. 
Time  of  treatment 
Strength 
of 
hydrogen 
Percentage  of  germination 
peroxide 
used  per 
cent. 
March  13 
March  19 
March  25 
April  2 
April  9 
20 
II 
31 
32 
34 
35 
40 
18 
56 
60 
64 
64 
1 8  hours  < 
60 
19 
63 
66 
69 
69 
80 
13 
6l 
62 
65 
67 
100 
14 
29 
35 
40 
4i 
20 
32 
52 
58 
59 
59 
40 
22 
60 
68 
70 
70 
24  hours  < 
60 
18 
39 
48 
52 
52 
80 
28 
36 
40 
44 
44 
100 
27 
39 
40 
44 
45 
20 
17 
4i 
49 
50 
55 
40 
12 
24 
29 
34 
39 
48  hours  ■ 
60 
34 
54 
55 
60 
60 
80 
23 
49 
53 
55 
56 
100 
16 
37 
39 
43 
44 
Table  XV, 
Total  Number  Germinated  of  all  Seeds  Treated  for  18,  24,  and  48  Hours,  Respectively. 
Time  of  treatment 
Number  of  s 
eeds  germinated  out  of  500 
March  13 
March  19 
March  25 
April  2 
April  9 
1 8  hours  
75 
240 
255 
272 
276 
24  hours  
127 
226 
254 
269 
270 
48  hours  
102 
205 
225 
242 
2-54 
