1. Attention is called to a recent paper dealing with the inheritance of number of kernel rows in maize (Tavcar, Alois - Beitrag zur Vererbung der Kornreihenanzahl an Maiskolben. Zeitschrift für Züchtung, Pflanzenzuchtung, 20: 364-376. 1935). A 4-rowed type is described and its genotype is assumed to be Rw₁ Rw₁. Crosses of 4-rowed with 8-rowed forms exhibit monohybrid F₂ and backcross ratios. To the genes differentiating these two forms are assigned the symbols Rw₂ rw₂. 4-row = Rw₁ Rw₁ rw₂ rw₂; 8-row = Rw₁ Rw₁ Rw₂ Rw₂. Rw₁ and Rw₂ are inherited independently of each other and of P and Y₁. [Since, on the author's assumption, Rw₁ is homozygous in both the 4-rowed and 8-rowed types used in these crosses, no evidence is presented for the independence of Rw₁ from Rw₂, P and Y₁. Of course Rw₁ could be used as a symbol for the residual genotype of a 4-rowed form, but there seems no more need for such a symbol here than in many other cases.]