Abstract
The wide distribution and early appearance of tissue with a great affinity for elastin stains indicates that this type of tissue plays an important part in the functional development of many organs; its appearance is in certain cases correlated with the time at which functioning of the organ begins.This work was undertaken during the course of an investigation on the human fœtus which is being carried out jointly with Professor M. L. Lucas Keene, and for which we beg to acknowledge a grant from the Thomas Smythe Hughes Medical Research Fund of the University of London. I also have to thank the Medical Research Council for a grant in aid.

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