270 
Transactions of the Boyal Society of South Africa. 
The range of variation appears to be limited, however ; a normally 
8-rowed type ranges between 4 and 14 rows, while a normally 18-rowed 
type ranges between 12 and 24 rows. 
The result of crossing au 8-row with an 18-row type of maize is to 
produce an intermediate type in the first generation ; both 8-row and 
18-row types practically disappear in the heterozygous form. The inter- 
mediate type bears mostly 10, 12, or 14 rows, the 12-row type greatly 
predominating. The experiment will be continued next year to deter- 
mine the proportion of the 8 row and 18-row types which reappear. The 
ears produced by the cross and the reciprocal cross are indistinguishable. 
A white-cobbed breed crossed with a red- cobbed produces a red cob in 
the first filial generation, and so does the reciprocal cross. 
