Gates, Tetraploid Mutants and Chromosome Mechanisms. 



Table I. contd. 



95 



8) This range of chromosome numbers occurred in different species, with 

 corresponding differences in nuclear size. 



9) That is, twelve "bi-gemini" or partly fused groups of four chromosomes. 

 In each case the nuclei and cells of the tetraploid forms are obviously larger, follow- 

 ing the rule developed by me in the case of 0. gigas, in 1909. 



10) This single pin-flower appeared as a bud mutation on a plant which bore 



