SMITHSONIAN    MISCELLANEOUS    COLLECTIONS  VOL.    96 
Table  2. — Average  Ratio  of  Length  of  First  Internode  to  Total  Length  of 
Seedling  for  Each  Experiment  and  for  Each  Wave-Length  Region 
in  the  Exposed  and  Dark  Series 
Wave 
lengrth 
A 
Exposed 
series 
Average 
Dark 
series 
Average 
Ratio 
exp. /dark 
Av.  ratio 
exp. /dark 
Ratio  av. 
exp.  to  av. 
dark  (0.89) 
4050 
.50| 
•52J 
•51 
.89-1 
•89J 
.89 
•56| 
•58J 
•57 
•57 
4265 
.50 
.53  J 
•52 
•90| 
.88] 
.89 
•57| 
.60] 
.59 
•58 
4405 
.55| 
.53J 
■54 
•90\ 
•85J 
.88 
.611 
.62  " 
.62 
.61 
4595 
.51} 
•55  J 
•53 
•891 
.86/ 
.88 
•571 
.64J 
.61 
.60 
4798 
.591 
•52J 
.56 
•90 1 
•83] 
•87 
.661 
.63; 
.65 
•63 
5005 
.55| 
•56J 
.56 
•8S| 
.88  ■ 
•87 
.65| 
.64J 
.65 
•63 
5195 
.55' 
.48- 
•47, 
•50 
•85' 
.84  . 
.85, 
•85 
•65~ 
•57  ' 
■55, 
.59 
.56 
5403 
.47~ 
.49  - 
•52 
•49 
.83] 
.76- 
•79 
•79 
•57' 
.64- 
.66 
.62 
•55 
5605 
.501 
•49J 
•50 
.8o| 
•81J 
.81 
•631 
.61] 
.62 
•56 
5795 
.45| 
.41J 
•43 
•75' 
•71 
■73 
.601 
.581 
•59 
.48 
5990 
.42| 
.45J 
•44 
f:\ 
•74 
:^3} 
•59 
•49 
6200 
.46 1 
.39j 
•43 
ti] 
•73 
:3 
•58 
.48 
6395 
•36I 
•36J 
•36 
.731 
.66] 
.70 
■491 
•55J 
.52 
.40 
6595 
.36| 
.36) 
.36 
•67| 
.69J 
.68 
■52 
.53 
.40 
6800 
•4i| 
•34J 
.38 
•671 
.62  ■ 
.65 
•:;} 
•58 
.43 
7005 
.42- 
•45." 
•44 
•65| 
•69] 
•67 
■651 
•65) 
•65 
•49 
7600 
•551 
.56] 
.56 
.841 
•85] 
•85 
•651 
.66/ 
.66 
•63 
*  In  the  first  nine  dark  experirrients  the  seedlings  were  grown  in  a  separate  moist  chamber. 
Since  there  was  no  possibility  of  exposure  to  stray  light,  the  average  ratio  of  first  internode 
to  total  length  for  these  nine  experiments  has  been  used  as  unity  in  determining  the  values 
in  the  last  column. 
