316  Studies  in  Plant  Mutation.  {Am•JJu0ly?lS)h6arm• 
Ipomoea,  26  seeds.    After  38  hrs.  48  hrs.  64  hrs.  81  hrs.  109  hrs. 
Water  control.  .  .  .   o                    o  o  1  2 
Brucine  o                    o  o  o  o 
Strychnine    .  .  .  .   o                    1  2  2  2 
Scopolamine  .  .  .  .   o                    o  1  1  5 
Atropine  o                    o  o  o  1 
Scopolamine  aids  most — 20  per  cent,  of  total  as  against  8  per 
cent,  with  control. 
Petunia,  joo  seeds.     After  38  hrs.  48  hrs.  64  hrs.  81  hrs.  109  hrs. 
Water  control  ...Co  o  o  2  12 
Brucine  o  o  o  8  23 
Strychnine  o  o  2  5  11 
Scopolamine   .  .  .  .  o  o  3  11  15 
Atropine  ........   o  o  7  17  27 
Hyoscyamine  ,  .  .  .   o  o  o  1  8 
Atropine  favors  germination ;  brucine  almost  as  much. 
Digitalis.— Only  one  of  five  species  of  Scrophulariacete  tested  to  germinate. 
After  109  hours. 
Water  control  .42 
Brucine  "  .  5 
Strychnine  g0 
Scopolamine  ,   o 
Atropine   7 
Hyoscyamine   o 
Cobaea  scandens — only  3  seeds  in  each  test  and  not  sufficient  for 
conclusions. 
Brucine  2,  strychnine  2,  and  atropine  1,  have  germinated  before 
water  control. 
Verbena,  50  seeds. — Water  control  discarded  on  account  of  mould  after  81  hours.  All 
were  more  or  less  mouldy.   The  results  were  as  follows,  when  control  was  discarded  : 
After  64  hrs.  81  hrs.  109  hrs. 
Water  control  o  o  discarded 
Brucine  o  o  o 
Strychnine  o  1  5 
Scopolamine  .0  o  8 
Atropine  o  2  7 
Hyoscyamine  o  o  4 
Summary. 
f  Schizanthus, 
• ,  ,  ,           ,    •  !  Tomato, 
Aided  by  strychnine  j  Egg  plant> 
[  Digitalis. 
Brucine  Petunia. 
...  f  Petunia, 
Atropine  <  ' 
1  Ipomoea. 
Hyoscyamine  Red  pepper, 
Scopolamine  Ipomoea. 
