Studies of Teratolocrical Phenomena. 



105 



not absolutely certain that it was tried. Dozens of flowers were bagged 

 and hand pollinated, but no seed ever resulted. One may call it a 

 reversal of dominance, i. e., a change from the intermediate to the 

 completely abnormal condition, but some internal disturbance of a 

 mutative nature must have accompanied this change, in order to account 

 for the sterility. Unfortunately, I knew so little concerning the nature 

 of my material and problems at the time that neither cuttings, nor 



Fig. 18. Flowers of parents and F^ hybrid (,300—1—5 X 373). 

 Four center flowers belong to hybrid. 



cytological material were secured. In the light of Digby's (1912) 

 studies on sterility in Primula kewensis, a cytological examination of 

 this case might have proved interesting. 



Flower variability on individual Fi plants (Fig. 18). 



The first flowers on a plant of the pure fasciated race were 

 usually the most abnormal. Flowers on plants maturing large numbers 

 of seed capsules were likely to be the least abnormal. Environmental 

 disturbances generally affected the variability of these organs in either 

 a plus or minus direction. And in order to compare the range of 

 variability of the fasciated expression in different plants and different 



