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The problem of formulating mathematically the interaction between one species of Host and one species of Parasite has been investigated recently by methods intended to be adequately comprehensive. Earlier investigations of this problem have been given by Lotka and Volterra, but both of these may be considered to be somewhat unsatisfactory on account of their neglect of the influence of the age-distribution on the interaction. The more comprehensive theory in which the age-distributions are taken into consideration, may evidently be used to examine whether their neglect by Lotka and Volterra can be justified. It is not, however, proposed to do this here, particularly as it appears that Volterra's formulation is not wholly self-consistent.

On the interaction between several species of hosts and parasites