Tovember^ST1*}    7  he  Germination  of  Belladonna  Seed.  489 
tall  and  very  narrow  graduated  cylinder  containing  about  1  Cc. 
to  the  inch,  and  the  scale  divided  into  tenths.  Table  IV  summarizes 
the  result. 
Table  IV. 
Relative  Per  Cent,  of  Light  and  Heavy  Seed  in  a  General  Lot  Formed  by  Separation 
According  to  Specific  Gravity. 
Portion 
Light 
Heavy- 
Weight 
Volume 
Weight 
Volume 
Gms. 
Per  cent. 
Cc. 
Per  cent. 
Gms. 
Per  cent. 
Cc. 
Per  cent. 
I 
8.25 
82.5 
16. 1 
84-3 
i-75 
17-5 
3-0 
15-7 
2 
7.81 
78.1 
15-5 
81.6 
2.19 
21.9 
3-5 
18.4 
3 
8.12 
81.2 
16.1 
84.7 
1.88 
18.8 
2.9 
15-3 
4 
8-53 
85-3 
17.2 
88.2 
1.47 
14.7 
2-3 
11. 8 
5 
8.68 
86.8 
17.4 
88.4 
1.32 
13.2 
2.3 
11.6 
6 
8.05 
80.5 
15.8 
82.3 
i-95 
19-5 
34 
17.7 
Average 
8.24 
82.4 
16.35 
84.9 
1.76 
17.6 
2.9 
151 
The  results  show  that  the  method  of  separation  is  fairly  accurate 
within  certain  limits.  Seeds  from  five  individual  plants  were  then 
separated  according  to  the  method  just  described,  with  the  results 
as  shown  in  Table  V. 
Table  V. 
Proportion  of  Light  and  Heavy  Seed  from  Five  Individual  Plants. 
Light 
Heavy 
Number 
of 
Weight 
Volume 
Weight 
Volume 
plant 
Gms. 
Per  cent. 
Cc. 
Per  cent. 
Gms. 
Per  cent. 
Cc. 
Per  cent. 
15 
6.26 
62.6 
11.6 
65.2 
374 
374 
6.2 
34-8 
47 
546 
54-6 
10.9 
58.9 
4-54 
454 
7.6 
41. 1 
4i 
7.98 
79.8 
16.0 
847 
2.12 
21.2 
3-o 
15-3 
I  IW 
7.90 
79.0 
154 
837 
2.10 
21.0 
3-0 
16.3 
14 
5-34 
534 
10. 0 
56.2 
4.66 
46.6 
7.8 
43-8 
There  appears  to  be  a  considerable  difference  in  the  proportion 
of  light  and  heavy  seeds  in  the  above  individuals,  while  in  all  of  them 
the  proportion  of  heavy  seeds  is  considerably  greater  than  in  the 
