Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 EFFECTS OF EXPOSING GERM-CELLS TO RAYS OF RADIUM 237 fluctuating variability, are transmitted from parent to offspring in sexual reproduction. The modification of a specific group, therefore, is an expression of the variation of one or more of its component individuals, and it Fig. 66. Omagra biennis. Permanently Arrested Development. The same Plant as is shown in figure 65, six Months later. Cf. figure 65. is clearly conceivable that the variation of only one individual, pro- vided it is of the nature known as d
Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 EFFECTS OF EXPOSING GERM-CELLS TO RAYS OF RADIUM 237 fluctuating variability, are transmitted from parent to offspring in sexual reproduction. The modification of a specific group, therefore, is an expression of the variation of one or more of its component individuals, and it Fig. 66. Omagra biennis. Permanently Arrested Development. The same Plant as is shown in figure 65, six Months later. Cf. figure 65. is clearly conceivable that the variation of only one individual, pro- vided it is of the nature known as discontinuous, and transmissible by heredity, would be quite sufficient material out of which to form a new specific group. It was from some such point of view as this that I undertook to see what would result on exposure of the germ-cells, male and female, of Onagra biennis to the rays of radium. I chose Otiagra biennis because it was the only species available when the radium could be had that had a pedigree, and of whose purity I was there- fore certain. I chose the germ-cells from a belief that, if they are uninfluenced by the environmental change, the resulting variation is not likely to be transmitted.* * Blaringhem/'^'^ however, has reported the inheritance of certain monstrosities produced in Zea Mays, oat, barley, and other herbaceous plants by traumatisms, such as compression, torsion, and cutting.
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