the group-agitation which we term matter, and the group-agitations extend their character to the environment. In truth, the notion of the self-contained particle of matter, self-sufficient within its local habitation, is an abstraction. Now an abstraction is nothing else than the omission of part of the truth. The abstraction is well founded when the conclusions drawn from it are not vitiated by the omitted truth.
This general deduction from the modern doctrine of physics vitiates many conclusions drawn from the applications of physics to other sciences, such as physiology, or even such as physics itself. For example, when geneticists conceive genes as the determinants of heredity. The analogy of the old concept of matter sometimes leads them to ignore the influence of the particular animal body in which they are functioning. They presuppose that a pellet of matter remains in all respects self-identical whatever
