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Intercrossing, in pigeons.
-on intercrossing of erratics.
Saporta believes that there was an astonishingly rapid development of the high plants, as soon [as] flower-frequenting insects were developed and favoured intercrossing.
The species results from the natural intercrossing of Fragaria vesca and Fragaria chiloensis, native species whose ranges overlap in that region.
This subject, and that of the variation of our domestic productions, together with the causes and laws of variation, inheritance, and the intercrossing of plants, are the sole subjects which I have been able to write about in full, so as to use all the materials which I have collected.