It is likely to be urged that since the civilised races are on the average larger than many of the uncivilised races, and since they are also somewhat more complex as well as more active, they ought, in accordance with the alleged general law, and other things being equal, to be less prolific. But other things are not equal; and it is to the inequality of the other things that this apparent anomaly is attributable. One more objection has to be met. Cases may be named of men conspicuous for activity, bodily and mental, who were also noted, not for less generative power than usual, but for more. The cases are analogous to some before-named in which more abundant food simultaneously aggrandises the individual and adds to the production of new individuals--the differences between cases being that instead of a better external supply of material there is a better internal utilisation of materials. Some peculiarity of organic balance, some potency of the digestive juices, gives to the system a perpetual high tide of rich blood that serves at once to enhance the vital activities and to raise the power of propagation. The _proportion_ between individuation and genesis remains the same: both are increased by the increase of the common stock of materials. _Human Population in the Future_ Any further evolution in the most highly-evolved of terrestrial beings--man--must be of the same nature as evolution in general. It must be an advance towards completion of that continuous adjustment of internal to external relations which was shown to constitute life. Looking at the several possibilities, and asking what direction this further evolution, this more complete moving equilibrium, this better adjustment of inner to outer relations, this more perfect co-ordination of action is likely to take:--the conclusion is that it must take mainly the direction of a higher intellectual and emotional development. There is abundant scope for development in ascertaining the conditions of existence to which we must conform; and in acquiring a greater power of self-regulation. What are those changes in the environment to which, by direct or indirect equilibration the human organism has been adjusting itself, is adjusting itself now, and will continue to adjust itself? And how do they necessitate a higher evolution of the organism? In all cases pressure of population is the original cause. Were it not for the competition this entails, so much thought and energy would not be spent on the business of life; and growth of mental power would not take place. Difficulty in getting a living is alike the incentive to a higher education of children, and to a more intense and long-continued application in adults. Nothing but necessity could make men submit to this discipline; and nothing but this discipline could produce a continued progression.