1914] 



CROCKER & DA VIS—DELA YED GERM IN A TION 



307 



TABLE XI 



Elongation of 14 Alistna embryos soaked in water 16 hours and then transferred 



I 



to 2 volume mol. cane sugar solution. Seed coats removed from both ends of the 

 embryos. Temperature 25 C. 



Treatment of embryos 



Air dry. 



16 hours in water 



a " sugar solution 



2 j- a a u u 



5 



Extreme individuals 



1. Air dry 



16 hours in water 



S u u sugar solution 



2 - 4. u S u 



2. Air dry 



16 hours in water 



S u " sugar solution 

 25 « « « « 



Total length of 

 embryos 



1378 

 1876 



1536 

 1543 



Average length of 

 embryos 



98.4 

 I34.0 



IO9.6 



II0.2 



Length of embryo 



98. 5 

 1490 



115. o 



115.0 



102 

 129 



1 05 

 108 



o 

 o 

 o 



o 



Percentage of 

 elongation 



36.I 



"3 



11. 9 



5*-o 

 16.7 



16.7 



26.4 



3-o 

 5-o 



XII 



:mbry 



volume mol 



^-^ 



TABLE XII 



Elongation of 13 Alisma embryos placed in water 16 hours and then transferred 

 to 1 volume mol. cane sugar for 25 hours. Seed coats removed from both ends of the 

 embryo. Temperature 25 C. 



Treatment of embryos 



Air dry 



16 hours in water 



5 u " sugar solution 



2 c * « « a 



Extreme individuals — 



i- Air dry 



16 hours in water 



u u sugar solution 



2. Air dry 



16 hours in water 



25 u " sugar solution 



Total length of 

 embryos 



1283.O 

 1716.O 



IS3SO 

 I56S-S 



Average length of 

 embryos 



98.7 

 132.O 



118. o 

 120.4 



Length of embryo 



87.O 

 138.O 

 109.0 



94.0 

 115. o 

 109.0 



Percentage of 

 elongation 



33-7 

 19.0 



22.0 



58.5 

 25-3 



22.3 

 16,0 



* m 



The 1 mol. cane sugar shows far less shrinkage than the 2 mol. 

 Fig. 8 shows these data in the form of curves. 



