Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 236 EFFECTS OF EXPOSING GERM-CELLS TO RAYS OF RADIUM in mind it seems almost self-evident that such a natural group of higher plants may not be artificially produced in the laboratory, nor, indeed, within the narrow confines of an experimental garden. But whether we may artificially produce a parent or ancestor of Fig. 65. Onagra biennis. Permanently x\rrested Development. The Ovary, after Pollination, was exposed for 53 Hours to the Rays from Radium Bromide (10,000 X) Contained in a sealed Glass Tube. Cf. figure
Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 236 EFFECTS OF EXPOSING GERM-CELLS TO RAYS OF RADIUM in mind it seems almost self-evident that such a natural group of higher plants may not be artificially produced in the laboratory, nor, indeed, within the narrow confines of an experimental garden. But whether we may artificially produce a parent or ancestor of Fig. 65. Onagra biennis. Permanently x\rrested Development. The Ovary, after Pollination, was exposed for 53 Hours to the Rays from Radium Bromide (10,000 X) Contained in a sealed Glass Tube. Cf. figure 66. a species is quite another question. A species has distinguishing marks because the individuals that compose it have those marks, and the group as a whole is separated from other groups of the same systematic rank for at least two reasons : (i) Because its individual members differ from the individual members of the other groups, and (2) because these distinguishing characters, within the range of
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