The two cases that I have been observing are brother and sister, eight and nine years old, respectively, and the observations have continued for a little more than two years. Both these children presented the curious anomaly of irregular deciduous teeth, though the teeth of both parents were, until extractions were practiced, remarkably regular. This irregularity of the temporary teeth meant, of course, contracted arches. In the case of the boy the contraction was so great that the lips fell in like those of an edentulous person (see cut of profile), giving him the appearance of a very old man. I greatly regret that I did not have a photographic profile made at the time, but his mother was so confident that she had one that I did not urge the matter, and it is now too late to secure this almost unique specimen.
The problem in both cases was