No. 626] FACTOR RELATIONS IN MAIZE 241 



usual type. Nine selfed ears were obtained and grown 

 the following year and all gave some plants with podless 

 ears and others with seeds in the tassels as well as plants 

 of the typical pod type. Xo record was made of the num- 

 bers in each class, but it was noted as rather suriDrisiug 

 that all of the nine ears gave some normal non-pod plants. 



An attempt was made to self-pollinate some of the 

 plants with the peculiar terminal inflorescences which 

 were easily recognized as the type which produced seed, 

 but no seed was obtained where they were enclosed in a 

 bag. Very little good pollen is produced in these tassels 

 and probably all or most of the seeds which are produced 

 on open-pollinated plants result from crossing with for- 

 eign pollen. One tassel with a number of such open-pol- 

 linated seeds was saved and the seed planted. No normal 

 non-pod ears were obtained. Most of the ears were of 

 the typical pod type or half-tunicate as named by Collins. 

 All of these results bear out the assumption of Collins 

 that the podded maize considered by Sturtevant (1899) 

 as a separate species and stated by him to have been 

 known for 300 years is not a constant type and has little 

 more claim to specific rank than the blue Andalusian 

 fowl. 



One of the half-tunicate ears produced from the open- 

 pollinated seed of the perfect flowered segregate was self- 

 pollinated, and when examined this ear was found to have 

 segregated into starchy and sweet seeds, showing that the 

 plant which had furnished the pollen had sweet seeds. 

 Since all the podded maize which had been grown up to 

 that time was starchy and all of the sweet maize was non- 

 podded, the cross involved the tunicate character and 

 starchy endosperm from the female ]iarent. and non- 

 tunicate, sweet endosiu^rm from tlie male. The starchy 

 and sweet seeds were planted >o]^arately. There were 173 

 of the starchy and forty-three of the sweet seeds. Not a 

 perfect 3:1 ratio, but reasonably close. All of the seeds 

 were planted, but since not all of each type produced a 

 mature plant, it is legitimate to correct the observed re- 



