i'jS Lutz, Triploid Mutants in Oeiiothera. 



Therefore, while it is probable that these numbers were derived 

 from the fertilization of unreduced female germ cells, it will be 

 well to bear the second possibility in mind. 



We may now consider the combinations possible on the basis 

 of the fore-going assumptions. In order to shorten the list somewhat, 

 the irregularity of the second type described by Gates and Davis 

 will not be considered. That of the type described by Geerts 

 will also be excluded, as it has thus far been reported only for 21- 

 chromosome hybrids. Otherwise, an attempt will be made to make the 

 list practically complete, regardless of the fact that many of the 

 combinations mentioned appear absurdly improbable and should 

 never be expected to occur. It should be borne in mind that this 

 list refers only to possibilities: 



I. 



1. Regularly reduced g -(-completed apogamous development. 



2. Regularly reduced g -(- regularly reduced cf. 



3. Regularly reduced g -f- regularly reduced cf failing to com- 

 plete the second division. 



4. Regularly reduced g -\- irregularly reduced cf. 



5. Regularly reduced g -f- irregularly reduced cf failing to com- 

 plete the second division. 



6. Regularly reduced g -j- unreduced cf. 



7. Regularly reduced g -j- unreduced cf failing to complete the 

 second division. 



II. 



1. Regularly reduced g failing to complete the second division -f- 

 completed apogamous development. 



2. Regularly reduced g failing to complete the second division -f- 

 regularly reduced cf- 



3. Regularly reduced g failing to complete the second division -|- 

 regularly reduced cf failing to complete the second division. 



4. Regularly reduced g failing to complete the second division -}- 

 irregularly reduced cf. 



5. Regularly reduced g failing to complete the second division -j- 

 irregularly reduced cf failing to complete the second division. 



6. Regularly reduced g failing to complete the second division -f- 

 unreduced cf- 



7. Regularly reduced g failing to complete the second division -j- 

 unreduced cf failing to complete the second division. 



III. 



1. Irregularly reduced g -[- completed apogamous development. 



2. Irregularly reduced g -\- regularly reduced cf 



:>. Irregularly reduced g -\- regularly reduced cf failing to com- 

 plete the second division. 



