"[W]hether we look to animal pleasures or to animal pains, the result is alike just what we should expect to find on the supposition of these pleasures and pains having been due to necessary and physical, as distinguished from intelligent and moral, antecedents; for how different is that which is from that which might have been! Not only might beneficent selection have eliminated the countless species of parasites which now destroy the health and happiness of all the higher organisms; not only might survival of the fittest, in a moral sense, have determined that rapacious and carnivorous animals should yield their places in the world to harmless and gentle ones; not only might life have been without sickness and death without pain;—but how might the exigences and the welfare of species have been consulted by the structures and the habits of one another! But no! Amid all the millions of mechanisms and habits in organic nature, all of which are so beautifully adapted to the needs of the species presenting them, there is no single instance of any mechanism or habit occurring in one species for the exclusive benefit of another species—although, as we should expect on the non-theistic theory, there are some comparatively few cases of a mechanism or a habit which is of benefit to its possessor being also utilised by other species. Yet, on the beneficent-design theory, it is impossible to understand why, when all mechanisms and habits in the same species are invariably correlated for the benefit of that species, there should never be any such correlation between mechanisms and habits of different species. For how magnificent, how sublime a display of supreme beneficence would nature have afforded if all her sentient animals had been so inter-related as to minister to each other's happiness! Organic species might then have been likened to a countless multitude of voices, all singing to their Creator in one harmonious psalm of praise. But, as it is, we see no vestige of such correlation; every species is for itself, and for itself alone—an outcome of the always and everywhere fiercely raging struggle for life."