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In principle the agglomeration of the nomands is not large, it counts some twenty to eighty persons, though one can come upon also larger ones. Dependent upon the capacity of water and food in a given area both the size of the group and the speed of the migrations are decided, because the peculiarities of the environment in defined social and cultural conditions exclude the possibility. of feeding a larger number of people on a defined territory. Rebus sic stantibus the number of the nomadic popul-ation is almost invariably defined by the environment. This fact is contradictory to the fecundity and sexual activity of the nomads, in conseąuence of which fecundity must adapt itself to the supply of food either by a limitation of progeny or by an increasse of food capacity (Nahrungsspielraum). Limitation of progeny or fertility is brought about by a) processes independent of man (natural selection), b) activities dependent on man i. e. conscious or unconscious limitations of births by means of abortion, in-fanticide, limitation of periods of sexual activity etc. — Subsistence in primitive society depends on 1) territory, 2) organisation and forms of cooperation, 3) technics. An increase of subsistence finds on these levels its expression above all in the tendencies for an extension of the territory, because the organisation as well as technics constitute here on the whole a stable element, unchanging in a certain period. In a new territory the structure of these three elements may remain unchanged and then the numerical proportions of the group will be established on the former conditions, or a change of structure may ensue which brings with it the passing over to a different economic type i. e. the settlement type, if environment and culture will admit it.

3. The influence of nomadism on organisation and law.

Organisation and law are influenced by nomadism directly as well as indirectly. Indirectly nomadism exercises its influence through interdependent secondary elements viz. through the economic and demographic fact.or. The demographic element exercises its influences in two ways: firstly by the size of the group by which the size of political organisms is influenced and secondly by the demographic conflict presented above. Not without influence on the legał and organisational forms is also the psy-