Power to endure.
[139] This includes the nourishment and protection of its young while helpless.
[140] This word is, I believe, used by Prof. Haeckel to describe his system of philosophy. I am very imperfectly acquainted with that system, and therefore think it well to note here that the term must not be taken with any special implications which Haeckel may have attached to it.
[142] Deontology, I, p. 32.
[143] Examination of Hamilton, pp. 586 sqq.
[144] Data of Ethics, §20.
[145] “I conceive it to be the business of moral science to deduce, from the laws of life and the conditions of existence, what kinds of action necessarily tend to produce happiness, and what kinds to produce unhappiness” (Data of Ethics, §21). Happiness is always taken by Spencer as equivalent to pleasurable feeling.
[146] Reason in Science, p. 252.
[147] See Data of Ethics, p. 36. It has been proved by exact physiological experiment that happiness promotes healthy vital action in the living organism, and that sorrow and pain depress it. But of course human life is not conducted solely on the physiological plane.