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Rh cooking them. Why then should we feel thirsty? Those people whose diet is free from such articles as chillies and onions which create an artificial thirst, have rarely any need to drink water. Those who feel unaccountably thirsty must be suffering from some disease or other.

We may be tempted to drink any kind of water that we come across, simply because we see some people doing it with impunity. The reply to this has already been given in connection with air. Our blood has in itself the power of destroying many of the poisonous elements that enter into it, but it has to be renewed and purified, just as the sharp edge of a sword has to be mended when it has been once employed in action. Hence, if we go on drinking impure water, we should not be surprised to find our blood thoroughly poisoned in the end. 



It is impossible to lay down hard and fast rules in the matter of food. What sort of food should we eat, how much of it should be eaten, and at what times,—these are questions on which doctors differ a great deal. The ways of men are so diverse, that the very same food shows different effects on different individuals.