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It is clear that the factors that direct the development of a wood frog's egg so that it becomes a wood-frog and not a tree-toad must lie in the egg itself, as derivatives from the two parent organisms. Weismann and his followers have proved that a peculiar substance in the nuclei of the egg and its daughter-products contains the essential factors of development, whatever these may be.
After the peepers, the next frog to appear is the clucking frog, a rather small, dark-brown frog, with a harsh, clucking note, which later in the season becomes the well-known brown wood-frog. Their chorus is heard for a few days only, while their spawn is being deposited. In less than a week it ceases, and I never hear them again till the next April.
It was absolutely motionless; the yellow brown of its back, and its dark sides, exactly harmonized in color with the light and dark patches on the log; the color was as concealing, here in its natural surroundings, as is the color of our common wood-frog among the dead leaves of our woods.
Just an ordinary snake, but with it a live wood-frog! This, at least, was interesting, the only real piece of magic I have ever done. Into my hat had gone only a live snake, now I brought forth the snake and a live frog. This was a snake to conjure with; so I tied him up again and finally got him home.
But there is another line of thought that should not be forgotten, though it is negative many animals are immune. Which are they? Our first business is to list them if we would learn the why of immunity. Frogs are among the happy ones. One day early in June I took a wood-frog in my hand. The mosquitoes swarmed about.
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