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Updated: May 5, 2025
I admit that the forces called vital are correlates of the forces called physical, if you choose to call that a distinction; but their character is conditioned by the state of the brain, and it comes to the same thing in the end.
Grahame believes in a providential 'ordeal, constituted by infant mortality, which is not, like war and vice, due to human corruption, but a beneficent regulating force which correlates fertility with the state of society. This might be taken by Malthus as merely amounting to another version of his checks.
The number of cells destroyed depends upon the intensity and duration of the effort that correlates their destruction. When a blacksmith wields a hammer for an hour, he uses up the number of cells necessary to yield that amount of muscular force. When a girl studies Latin for an hour, she uses up the number of brain-cells necessary to yield that amount of intellectual force.
In learning to draw, it is necessary to acquire the art of representing things according to the sensation, not according to the perception. And the visual appearance is filled out with feeling of what the object would be like to touch, and so on. This filling out and supplying of the "real" shape and so on consists of the most usual correlates of the sensational core in our perception.
Brain tissue, including both quantity and quality, correlates mental power. The brain is manufactured from the blood; its quantity and quality are determined by the quantity and quality of its blood supply. Blood is made from food; but it may be lost by careless hemorrhage, or poisoned by deficient elimination.
We have also to consider the psychological effects of sensations, as opposed to their physical causes and correlates. These problems are quite distinct from those with which we have been concerned in the present lecture, and I shall not deal with them until a later stage. It is clear that psychology is concerned essentially with actual particulars, not merely with systems of particulars.
For instance, take any well-tabulated synopsis of our categories and their relations, and they would nearly all have to be recast or entirely abandoned. Time, space, matter, motion, intellect, abstract ideas, volitions, affections, etc., with their several correlates or co-relations, would all have to undergo a thorough recasting process.
When we can definitely determine the centre of vital force, as exercised in building up vital structure, not in wielding pickaxes, it is to be hoped we shall be able to distinguish, by the proper correlates, vital force from that which is mechanical. But the task is manifestly a hopeless one with the materialists.
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