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A Theory of the Formation of Animals by W. T. Hillier

By W. T. Hillier

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B u t we have already got on too fast, and there are things which the reader will want to have explained. First of all, if t h e hypothesis states t h a t every animal is built u p of two animals, how can it be t h a t Polygordius begins with four ? 3 34 THE FORMATION OF ANIMALS The answer t o this is t h a t the four are in reality two successive pairs, and do not correspond to four simultaneously existing animals. There is, however, ground for thinking t h a t the union of the one pair with the other pair of blastulae, to make u p the four, reflects a very early union in the life history of these ancestors, taking place, probably, while t h e animals were yet in a larval stage.

I t would have to be made in some engineering works. Let the reader come as a visitor to these works and be shown round them. H e would visit the erecting shop and see there t h e finished thing and the main details of how it is constructed. I n the case of Polygordius he has seen this in the account which has been given of its a n a t o m y . Then t h e visitor would go to the various machine shops and see how the parts were built u p . This corresponds to t h e developmental history, which has been given.

An evenly-curved line through all t h e points marked in this way will give a regular spiral, and this spiral comes t o an end a t the centre. This is t h e most regular t y p e of spiral. Many other types of spiral m a y be drawn b y other methods, b u t this simple t y p e seems t o be all t h a t is necessary for explaining the formation of t h e organs of Polygordius. I t is evident t h a t although the spiral comes t o an end at the centre, yet, by continuing the same process of marking the radii past t h e centre, a similar spiral will be drawn, which, however, opens out instead of closing in as the former one did.

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