1. Recent morphological studies of the chromosomes of strains of Indian corn and of teosintes from the experiment station at Chapingo near Mexico City have shown several strains in which chromosome 10 is abnormal. This chromosome has a piece attached to the end of the long arm about the length of its short arm. This piece is much knobbed and at present nothing definite can be said concerning its origin.

A small quantity of both corn and teosinte seed carrying this abnormality are available for distribution.

A. E. Longley