BULLETIN 971, U. S. DEPAHTMENT OF AGRICULTURE. 





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Fig. 4. — Frequency distributions with respect to the num- 

 ber of branches on the ear in plants of the second- 

 generation ramose segregates of Ramosa-Gordo maize 

 hybrids. 



rows and the length 

 of the ear spike and 

 —0.472 between the 

 total number of 

 branches and the 

 number of rows. 

 Both coefficients in- 

 dicate that as the cen- 

 tral axis approaches 

 a normal ear in 

 length it also resem- 

 bles a normal ear in 

 the number of rows. 

 Among the tassel 

 'characters no corre- 

 lations are found 

 which are not capa- 

 ble of obvious ex- 

 planation. Thus big 

 tassels have long 

 central spikes, while 

 the longer the cen- 

 tral spikes the fewer 

 the branches. 



Table II. — Sum-mary of the correlations between the ear and tassel characters 

 in the second generation of Ramosa-Gordo maize hybrids. 



[The population for which these coefficients were calculated consists of 102 individuals. Any coefficient 

 greater than 0.196 exceeds three times the probable error.] 







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Character designation. 



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1-5 



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Branches on ear 





-0. 472 



-0. 596 



0.235 



-0. 642 



0. 055 



-0. 237 



0.546 



-0. 291 



Number of rows on the cen- 







tral spike of the ear 



-0. 472 





.756 



.300 



.745 



.147 



.192 



- .308 



.156 



Length of the terminalspike 





















of the ear 



- .596 

 .235 



.756 

 .300 



"".'39i' 



.391 



.946 

 .179 



.163 

 .398 



.241 

 .147 



- .393 

 .035 



.154 



Length of the entire ear 



- .103 



Ear spikeindex 



- .642 

 .055 



.745 

 . 147 



.946 

 .163 



.179 

 .398 



.134 



.134 



.212 



.407 



- .406 

 .123 



.152 



Length of tassel 



- .115 



Length of the central spike 





















of the tassel 



- .237 



.192 



.241 



.147 



.212 



.407 





- .409 



.811 



Number of branches in the 





tassel 



.546 

 - .291 



-. 308 

 .156 



- .393 

 .154 



.035 

 - .103 



- .406 

 .152 



.123 

 - .115 



-. 409 

 .811 



-'.'563' 



-. 503 



Central spike index 









THIRD GENERATION. 



The appearance at harvest of markedly intermediate ears as- 

 sociated with intermediate tassels indicated that intermediate forms 



