Chapter 17
One origin of physical deformities
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FIG. 100. Disturbed heredity. Above, father a primitive coastal Indian of Peru with normal facial and dental arch development. Son at right presents distortions of both facial and dental arch form. Below, father a primitive Andean Indian with excellent facial and dental arch form. His son at right has not reproduced the racial pattern. Both sons are full blood.
Fig. 102, two sisters and two brothers. In each pair there is a marked change in the facial form of the younger. The arches and the nostrils of the younger child are narrower and there is a marked lack of development in both the middle and lower thirds of the face. ... These families demonstrate a lowering of reproductive capacity of the parents with the later born children.
Two serious defects from which many individuals in our modernized civilization suffer are impacted teeth and the absence of teeth due to their failure to develop. It is significant that in the arches of the primitive races practically all teeth form and erupt normally, including the third molars. In the modernized primitives and among our modern whites with deformed dental arches many teeth are impacted and often several of the permanent teeth have never formed.
The evidence indicates that this, like the facial and dental arch deformities is due to an absence of vitamin A in the diet of the mother during the gestation period or of one or both of the parents prior to conception. The cause is discussed in the next chapter.