Problems of Evolution

Cover Problems of Evolution
Problems of Evolution
F W Frederick Webb Headley
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This it is, and not her qualified constancy, which has effected the isolation which is the necessary condition, if noble flowers are to result from her work. For insects, un- restricted, would have been authors of confusion and chaos.
A few examples of the working of insects will show their defects as makers of species. In a field of buttercups there are often two species in blossom side by side, Ranuiicidus hiilbosus and R. Acr'is. The former begins to blossom a good deal earlier than the latt
...er, but the flowering times of the two overlap. If you watch a bee among them she will often for a time keep to one species. R. Acr'u stands up a great deal higher, and, owing to this, she will often for a time pass over R. Hulbosiis. But before long she will often change her level and busy herself with the lower-growing species. In a bed of mixed polyanthus flowers bees may be seen going from one colour to another heedless of theories and of the claims of polytypic evolution. The same thing takes place when they are busy upon rhododen- drons and columbines of slightly, or even widely, different tints.

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