To come back now to our primeval savage, when he sees in a dream his deceased comrade and mistakes the vision for a reality, his error is not concerned with the most fundamental part of the matter. The all-important fact is that this dreaming savage has somehow acquired a mental attitude toward death which is totally different from that of all other animals, and is therefore peculiarly human. Throughout the half-dozen invertebrate branches or sub-kingdoms, where intelligence is manifested only in its lower forms of reflex action and instinct, we find no evidence that any creature has come to know of death. There is a sense, no doubt, in which we may say that the love of life is universal. As a rule, all animals shun danger, and natural selection maintains this rule by the pitiless slaughter of all delinquents, of all in whom the needful inherited tendencies are too weak. But in the lower animal grades and in the vegetal world the courting of life and the shrinking from death go on without conscious intelligence, as the blades of grass in a meadow or the clustering leaves upon a tree compete with one another for the maximum of exposure to sunshine until perhaps stout boughs and stems are warped or twisted in the struggle. Among invertebrates, even when we get so high as lobsters and cuttlefish, the consciousness attendant upon the seizing of prey and the escape from enemies probably does not extend beyond the facts within the immediate sphere of vision. Even among those ants that have marshalled hosts and grand tactics there is doubtless no such thing as meditation of death. Passing to the vertebrates, it is not until we reach the warm-blooded birds and mammals that we find what we are seeking. Among sundry birds and mammals we see indications of a dawning recognition of the presence of death. An early manifestation is the sense of bereavement when the maternal instinct is rudely disturbed, as in the cow mourning for her calf. This feeling goes a little way, but not a great way, beyond the sense of physical discomfort, and is soon relieved by milking. Much more intense and abiding is the feeling of bereavement among birds that mate for life, and among the higher apes, and it reaches its culmination in the dog whose intelligence and affections have been so profoundly modified through his immensely long comradeship with man. Nowhere in literature do we strike upon a deeper note of pathos than in Scott's immortal lines on the dog who starved while watching his young master's lifeless body, alone upon a Highland moor:-- "How long didst thou think that his silence was slumber? When the wind stirred his garment, how oft didst thou start!"