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ancestors of the whole frog stem were fishes, the first thing to develop from the frog's egg will be a fish and it will only later assume the form of a frog.

"That is a simple and pictorial outline of what we mean when we speak of the biogenetic law. We need, of course, much more than the one frog-fish before we can erect it into a law. But we have only to look around us and we find similar phenomena as common as pebbles.

"Let us bear in mind that evolution proceeded from certain amphibia to the lizards and from these to the birds and mammals. That is a long journey, but we have no alternative. If the amphibia (such as the frog and the salamander) descend from the fishes, all the higher classes up to man himself must also have done so. Hence the law must have transmitted even to ourselves this ancestral form of the gill-breathing fish.

"What a mad idea, many will say, that man should at one time be a tadpole like the frog! And yet—there's no help in prayer, as Falstaff said—even the human germ or embryo passes through a stage at which it shows the outlines of gills on the throat just like a fish. It is the same with the dog, the horse, the kangaroo, the