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are not. For the hindrances to knowledge are many, the darkness of the subject and the shortness of man's life." Numbers of people, no doubt, went as far as this, and without suffering for it as Protagoras did; but his scepticism cut deeper and raised questions still debated in modern thought. "Man is the measure of things"; there is no truth to be had beyond the impression made on a man's mind. When this given object seems one thing to A and another thing to B, it is to each one exactly what it seems; just as honey not only seems sweet but is sweet to a healthy man, and not only seems bitter but is bitter to a man with jaundice. Then you can not say, we may ask, that one or other impression is false, and will prove false on further inquiry? No: he answers; each impression is equally true. The only difference is that each state of mind is not equally good. You cannot prove to the jaundiced man that his honey is sweet, for it is not: or to the drunkard that he does not desire his drink, for he does: what you can do is to alter the men's state of mind, to cure the jaundice or the drunkenness. Our cognition flows and changes. It is the result of an active impact upon a passive percipient. And, resulting