Note 25 — II
Reading edition
See A. T. Cameron, “Radio-Chemistry,” p. 17: “The curves illustrate two further points. They approach constant value towards the end of a month, but it is seen that they reach a final value only at infinite time. This property is common to all such curves; it illustrates the fact that the life of a radio-active element is infinite.” It is explained in the same book (p. 31) that “infinity is only a relative term; in this connection it only means a longer time than we can measure.”