Crossword-Solution: MUTATIVE 8 letters, 1 clue 🏆 scrabble score: 13

MacDougal, by [viii] his publications, has introduced my results to his American colleagues, and moreover by his cultures of the mutative species of the great evening-primrose has contributed additional proof of the validity of my views, which will go far to obviate the difficulties, which are still in the way of a more universal acceptation of the theory of mutation.

Such is the case with the mutative origin of _Xanthium commune_ Wootoni from New Mexico and of _Oenothera biennis cruciata_ from Holland.

This assumption requires only a limited number of mutative periods, which might well occur within the time allowed by physicists and geologists for the existence of animal and vegetable life on the earth.

But the chance of mutative changes in larger numbers is manifestly much reduced by this experiment, and they may be expected to form a very small proportion of the culture.

And in crossing experiments also the red-veins gave proof of the absence of a mutative capacity for their production.