It is not likely that man's body will admit of _great_ change, but there
is room for some improvement, e.g. in the superfluous length of the
food-canal and the overcrowding of the teeth. It is likely, however,
that there will be constitutional changes, e.g. of prolonged
youthfulness, a higher standard of healthfulness, and a greater
resistance to disease. It is justifiable to look forward to great
improvements in intelligence and in control. The potentialities of the
human brain, as it is, are far from being utilised to the full, and new
departures of promise are of continual occurrence. What is of great
importance is that the new departures or variations which emerge in fine
children should be fostered, not nipped in the bud, by the social
environment, education included. The evolutionary prospect for man is
promising.
[Illustration: PHOTOGRAPH OF A MEDIAN SECTION THROUGH THE SHELL OF THE
PEARLY NAUTILUS