Another fact is that each set of means, with its accompanying satisfactions, eventually becomes in its turn dependent on one originating later than itself. Before the gullet swallows, the jaws must lay hold; before the jaws tear out and bring within the grasp of the gullet a piece fit for swallowing, there must be that co-operation of limbs and senses required for killing the prey; before this co-operation can take place, there needs the much longer co-operation constituting the chase; and even before this there must be persisted activities of limbs, eyes, and nose in seeking prey. The pleasure attending each set of acts, while making possible the pleasure attending the set of acts which follows, is joined with a representation of this subsequent set of acts and its pleasure, and of the others which succeed in order; so that along with the feelings accompanying the search for prey, are partially aroused the feelings accompanying the actual chase, the actual destruction, the actual devouring, and the eventual satisfaction of appetite. A third fact is that the use of each set of means in due order, constitutes an obligation. Maintenance of its life being regarded as an end of its conduct, the creature is obliged to use in succession the means of finding prey, the means of catching prey, the means of killing prey, the means of devouring prey. Lastly, it follows that though the assuaging of hunger, directly associated with sustentation, remains to the last the ultimate end; yet the successful use of each set of means in its turn is the proximate end--the end which takes temporary precedence in authoritativeness. § 59. The relations between means and ends thus traced throughout the earlier stages of evolving conduct, are traceable throughout later stages: and hold true of human conduct, up even to its highest forms. As fast as, for the better maintenance of life, the simpler sets of means and the pleasures accompanying the uses of them, come to be supplemented by the more complex sets of means and their pleasures, these begin to take precedence in time and in imperativeness. To use effectually each more complex set of means becomes the proximate end, and the accompanying feeling becomes the immediate gratification sought; though there may be, and habitually is, an associated consciousness of the remoter ends and remoter gratifications to be obtained. An example will make clear the parallelism.