I happened one day to converse with an excellent French cook about the delicate art which he professed, and he comprised the whole of it under two heads--the knowledge of the mutual influences of ingredients, and the judicious management of heat. It struck me that there existed a very close analogy between cookery and education; and, on following out the subject in my own way, I found that what he told me suggested several considerations of the very highest importance in the culture of the human intellect. Amongst the dishes for which my friend had a deserved reputation was a certain _gâteau de foie_ which had a very exquisite flavor. The principal ingredient, not in quantity hut in power, was the liver of a fowl; but there were several other ingredients also, and amongst these a leaf or two of parsley. He told me that the influence of the parsley was a good illustration of his theory about his art. If the parsley were omitted, the flavor he aimed at was not produced at all; but, on the other hand, if the quantity of parsley was in the least excessive, then the _gâteau_ instead of being a delicacy for _gourmets_ became an uneatable mess. Perceiving that I was really interested in the subject, he kindly promised a practical evidence of his doctrine, and the next day intentionally spoiled his dish by a trifling addition of parsley. He had not exaggerated the consequences; the delicate flavor entirely departed, and left a nauseous bitterness in its place, like the remembrance of an ill-spent youth. And so it is, I thought, with the different ingredients of knowledge which are so eagerly and indiscriminately recommended. We are told that we ought to learn this thing and that, as if every new ingredient did not affect the whole flavor of the mind. There is a sort of intellectual chemistry which is quite as marvellous as material chemistry, and a thousand times more difficult to observe. One general truth may, however, be relied upon as surely and permanently our own. It is true that everything we learn affects the _whole_ character of the mind.