instruments of the control of the future of the nervous system. In
general, meanwhile, the eugenist should strive for raising the level
of the endocrine potential, and discourage its lowering. That means
the encouragement of matings in which all the internal secretion
activities are reinforced. On the other hand, those internal secretion
combinations, generally leading to a deficiency of all of them which
produce types of mental defectives, delinquency and crime should not
be allowed to occur.

THE INFLUENCE OF ENVIRONMENT

What suggestions now are there for the euthenist who would control
the influence of environment upon child culture. There are certain
pertinent facts and leads that are worth considering.

In analyzing environment, one must distinguish sharply in the jungle,
the non-living factors from the living. For while the nonliving act
upon the endocrines directly, the living act upon the vegetative
system, as a whole. The non-living factors are those with the intimate
scrutiny of which physics and chemistry have busied themselves: food,
water, air, light, heat, electricity, magnetism. The living are the
animals that prowl all over the planet, the predatories spreading the
gospel of fear.

The dietetic habits of a person, for instance, are known to have an
influence upon the glands of internal secretion. Meat-eating produces
a greater call upon the thyroid than any other form of food. In time
this ought to produce a degree of hyperthyroidism in the carniverous
populations. Pre-war statistics concerning meat-eating in different
countries show the greatest meat-eating among the English-speaking
groups, who all in all must be admitted the most energetic.

_Meat per Day per_
_Countries_ _Capita in Grams_

Australia 306
U.S. of America 149
Great Britain 130
France 92
Belgium and Holland 86
Austria-Hungary 79
Russia 59
Spain 61
Italy 29
Japan 25

Sea-water contains iodine. People living in contact with sea-water
would be apt to get more iodine in their systems, and so a greater
degree of thyroid activity. On the other hand, certain bodies and
sources of inland water