The theory of the struggle for existence, the doctrine that the germs of new life exist in much larger numbers than are maintainable with the existing means of existence, would be wholly applicable to man if man, instead of straining his brains and enlisting the services of technical arts for exploiting air, land and water, grazed like cattle, or like monkeys indulged his sexual impulses with cynic shamelessness,—in short, if he reverted to the monkey order. In passing be it observed that the fact that, besides man, monkeys are the only beings with whom the sexual impulse is not fixed to certain periods, is a striking proof of the relationship between the two. But though closely related, they are not identical, and are not to be placed on one level and measured by one standard,—a fact that we commend to Ziegler, who, in his book herein frequently referred to, holds up the two together.

The circumstance that, under the conditions of ownership and production that have hitherto prevailed, the struggle for existence existed and continues to exist for man also and many fail to find the conditions for life, is perfectly true. But these failed, not because of the scarcity of the means of existence, but because, due to social conditions, the means of existence, though in greatest abundance, were kept from them. False also is the conclusion that, because such has hitherto been the state of things, it is unchangeable and will ever be so. It is here that the Darwinians slide and fall: they study natural science and anthropology, but not sociology, and thoughtlessly fall in line with our bourgeois ideologists. Hence they drop into their false conclusions.

The sexual instinct is perennial in man; it is his strongest instinct and demands satisfaction, lest his health suffer. Moreover, as a rule, this instinct is strong in proportion to man's health and normal development—just as a good appetite and a good digestion bespeak a healthy stomach, and are the first prerequisites for a healthy body. But gratification of the sexual instinct and begetting and conceiving are not the same thing. The most varied theories have been set up on the fecundity of the human race. On the whole, we are still groping in the dark on this important field, mainly because for a couple of thousand years a senseless shyness has stood in the way of man's occupying himself freely and naturally with the laws of his own origin, and to study thoroughly the laws of human procreation. That is gradually changing and must change much more.

On one side the theory is set up that higher mental development and strenuous mental exertion, in short, higher nervous activity, exert a repressing influence upon the sexual impulse and weaken the procreative power. This is disputed by the other side. The fact is pointed to that the better situated classes have, on an average, fewer children and that this is not to be ascribed solely to preventive measures. Undoubtedly, intense mental occupation has a depressing influence upon the sexual impulse, but that such occupation is indulged in by the majority of our property classes is not so certain. On the other hand, an excess of physical labor also has a repressing influence. But all excessive effort is harmful, and therefore objectionable.

Others, again, claim that the manner of life, especially the food eaten, coupled with certain physical conditions on the part of the woman, determine the power to beget and to conceive. The nature of food more than any other cause, this side argues, determines, as experience shows in the instance of animals also, the effectiveness of the act of procreation. Possibly, this is in fact, the determining factor. The influence of the nature of nourishment on the organism of certain animals manifests itself surprisingly with bees: they produce at will a queen by the administering of special food. Bees, accordingly, are further advanced in the knowledge of sexual development than men. They have not, probably, been sermonized for two thousand years that it is "indecent" and "immoral" to concern themselves with sexual matters.

It is also known that plants raised on good soil and well manured, thrive luxuriantly, but yield no seed. That the nature of the food has its influence upon the composition of the male sperm, and upon the fecundity of the female egg with human beings also, is hardly to be doubted. Thus mayhap the procreative power of the population depends in a high degree upon the nature of the food it lives on. Other factors, whose nature is still but little understood, also play a role. It is a striking circumstance that a young couple may have no children after long years of married life, yet, having separated, and each having mated again, both new marriages are followed by healthy children.

One factor is of leading importance in the question of population in the future—the higher, freer position which all women will then occupy. Leaving exceptions aside, intelligent and energetic women are not as a rule inclined to give life to a large number of children as "the gift of God," and to spend the best years of their own lives in pregnancy, or with a child at their breasts. This disinclination for numerous children, which even now is entertained by most women, may—all the solicitude notwithstanding that a Socialist society will bestow upon pregnant women and mothers—be rather strengthened than weakened. In our opinion, there lies in this the great probability that the increase of population will proceed slower than in bourgeois society.

Our Malthusians need really not break their heads on the future of the human race. Until now nations have gone down through the decline, never through the increase of their population. In the last analysis, the number of population is regulated without harmful abstinence and without unnatural preventives, in a society that lives according to the laws of Nature. On this head also the future will vindicate Karl Marx. His theory also that every period of economic development carries with it its own law of population will prove true under the rule of Socialism.

The author of the work "Die kuenstliche Beschraenkung der Kinderzahl" (The Artificial Limitation of Progeny)[235] claims that Socialism is playing a tricky manoeuvre by its opposition to Malthusianism: a rapid increase of population promotes mass proletarianization, and this, in turn, promotes discontent: if over-population is successfully checked, the spread of Socialism would be done for, and its Socialist State, together with all its glory, buried for all time. Thus we see one more weapon added to the arsenal to kill Socialism with—Malthusianism. The grandiose ignorance of the Socialist-killer Ferdy on Socialism, transpires strongest from the following sentence, which he perpetrates on page 40 of his work: