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Updated: May 10, 2025
The foremost section, which is turned towards the ventral side, and from which the aortic arches rise, reproduces the arterial bulb of the Selachii. The heart of the human embryo is now a complete fish-heart. Transverse section of the back of the head of a chick-embryo, forty hours old.
Transverse section of the trunk of a chick-embryo, forty-five hours old. The great majority of the Invertebrates that have acquired an independent vascular system have only colourless lymph-cells in the circulating fluid.
This is one of those fatal mis-growths that show the great part that blind chance has in organic development. Transverse section of the head of a chick-embryo, thirty-six hours old. Thus the thoracic cavity of the mammals, with its important contents, the heart and lungs, belongs originally to the HEAD-PART of the vertebrate body, and its inclusion in the trunk is secondary.
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