or altruism was produced, _i.e._, the sense of social solidarity
based on the sentiment of duty.

The last is still very weak in man, while some animal species, such as
the bees and ants, have developed it in a more complete manner, on the
basis of instinct. According to this natural law, all social
organization naturally develops altruism or the sentiment of duty. The
history of humanity proves that our social union is only developed
slowly and laboriously through innumerable contests, and that it is
derived, directly or indirectly, from the family union of individuals.
Extension of communication on the surface of the earth causes the
artificial development of social organization to advance much more
rapidly than the natural phylogenetic development by evolution of the
sentiments or social instincts. The latter are, however, forced to
follow the movement, resting first on the deep roots of family and
friendly altruism, as well as on that of caste or clan (patriotism);
_i.e._, on sentiments of sympathy and duty toward certain individuals
who are more closely connected with us, sentiments which are
hereditary in man. A vague general humanitarian sentiment, a hothouse
flower which is still feeble, has already commenced to grow on this
natural basis. Let us hope that it will live.

It would be a fundamental error to try and found social solidarity
solely on our phylogenetic sentiments of sympathy, or on our ideal
faculty of devotion and self-sacrifice; but to try and take egoism as
a basis for this solidarity is a still greater error. We must not make
an antinomy of egoism and altruism, but regard them as two elements
inseparable from all human society, as well as the individuals who
compose it. We cannot deny that the altruist, endowed with strong
sentiments of sympathy and duty, is an excellent social worker, while
the pure egoist constitutes an element of decomposition for society.
It is, therefore, a social duty to proceed by the sexual route to a
selection which will cause the first to multiply and eliminate the
second as far as possible by sterilizing his germs.

CHAPTER VIII

SEXUAL PATHOLOGY

On this subject we refer the reader to the well-known work of
Krafft-Ebing, "Psychopathia Sexualis,"[4] in which will be found a
number of observations, the details of which we cannot enter into
here. We may first of all say that with the exception of venereal
diseases the genital organs by themselves only play