This paper is concerned with some of the effects resulting from the artificial introduction of chromatin from one species into another, namely, from teosinte into maize. Teosinte, the closest relative of maize, grows as a weed in and around the corn fields in parts of Mexico and in a wild or feral state in parts of Guatemala. Teosinte resembles maize in many of its botanical characteristics but differs from it quite substantially in others. It has the same chromosome number as maize, ten, and hybridizes readily with it to produce highly fertile hybrids in which pairing of the chromosomes appears to be regular to a remarkable degree and in which the crossing over between the maize and teosinte chromosomes is, with few exceptions, of the same order as it is in corresponding regions in pure maize (Emerson
and Beadle, 1932).

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