...obtained. Darwin himself suggested that the clue might be found in the consideration that at whatever age a variation first appears in the parent, it tends to reappear at a corresponding age in the offspring ; but this must be regarded rather as a statement of the fundamental fact of embryology than as an...

...period, ju I have stated in the first chapter, that there is some y evidence to render it probable, that at whatever age any variation first appears in...reappear at a corresponding age in the offspring. Certain variations can only appear at corresponding ages, for instance, peculiarities in the caterpillar,...

...early period. I have stated in the first chapter, that there is some evidence to render it probable, that at whatever age any variation first appears in...reappear at a corresponding age in the offspring. Certain variations can only appear at corresponding ages, for instance, peculiarities in the caterpillar,...

...shape, as long as it was fed by its parents. I have stated in the first chapter, that at whatever age a variation first appears in the parent, it tends to...re-appear at a corresponding age in the offspring. Certain variations can only appear at corresponding ages ; for instance, peculiarities in the caterpillar,...

...shape, as long as it was fed by its parents. I have stated in the first chapter that at whatever age a variation first appears in the parent, it tends to reappear at a corresponding age in the offspring. Certain variations can only appear at corresponding ages ; for instance, peculiarities in the caterpillar,...

...found. Darwin himself suggested that the clue might be found in the consideration that at whatever age a variation first appears in the parent, it tends to reappear at a corresponding age in the offspring ; but this must be regarded rather as a statement of the fundamental fact of embryology than as an...

...shape, as long as it was fed by its parents. I have stated in the first chapter, that at whatever age a variation first appears in the parent, it tends to...re-appear at a corresponding age in the offspring. Certain variations can only appear at corresponding . ages ; for instance, peculiarities in the caterpillar,...

...shape, as long as it was fed by its parents. I have stated in the first chapter, that at whatever age a variation first appears in the parent, it tends to reappear at a corresponding age in the offspring. Certain variations can only appear at corresponding ages ; for instance, peculiarities in the caterpillar,...

...generally appear at a not very earl1 period of life,7' and secondly, that "at whatever age a variatioi first appears in the parent, it tends to reappear at a corresponding age in the offspring." He then argues that it is with nature a with the fancier, who does not care what his pigeons look lik<...

..."may have supervened at a not very early period in life" (that is, late in embryonic life); and third, "that at whatever age any variation first appears...reappear at a corresponding age in the offspring" (p. 444). Darwin's hypothesis of descent with modification — that is, natural selection acting on...