Abstract
Studying the delicate character of the Japanese morning glory, the writer found two lines, the one being constant and the other inconstant. In the inconstant line, in which the delicate gene freqently changes to “normal, ” the mosaic individuals making vegetative mutation occur at 8.5 percent and the seminal mutants at 4.9 percent. A pedigree with 33.3 percent mosaics appaered sporadically. Two periclinals, normal-like leaf with split corolla and delicate-like leaf with entire corolla, arised as bud-variations, the former being due to the mutation from “delicate” to “normal” in the mesohistogen and the latter in the ectohistogen. The inconstant delicate acts as incomplete dominant to the constant form.
