"Precisely so," answered Faraday in an amused tone, which showed that the "new law" was more familiar to him than to his visitor, who, somewhat abashed, said, "Pray, how long have you known this?" "Oh, ever since I was a boy," was the reply; but the innate kindliness of his nature must show itself even in such a case, for, seeing the old gentleman's disappointed look, he added that he was not to be grieved, he might possibly some day alight upon something really new. The last course of Faraday's Juvenile Lectures--on "The Chemical History of a Candle"--has been referred to once or twice. These lectures are indeed of very great interest, not only in themselves as chemical illustrations, but as being part of Professor Faraday's best known works, and the only juvenile lectures of his which are obtainable in the form of a book. The way in which he introduced his subject will show us how simple, and yet how explicit he was in explaining to his young audience the phenomena which he brought before them. "I purpose," he said, to quote the beginning of the initial lecture of the series of six, "in return for the honour you do us by coming to see what are our proceedings here, to bring before you in the course of these lectures, the chemical history of a candle. I have taken this subject on a former occasion, and were it left to my own will, I should prefer to repeat it almost every year--so abundant is the interest that attaches itself to the subject, so wonderful are the varieties of outlet which it offers into the various departments of philosophy. There is not a law under which any part of this universe is governed which does not come into play, and is touched upon in these phenomena. There is no better, there is no more open door by which you can enter into the study of natural philosophy, than by considering the physical phenomena of a candle. I trust, therefore, I shall not disappoint you in choosing this for my subject rather than any newer topic, which could not be better, were it even so good. "And before proceeding, let me say this also--that though our subject be so great, and our intention that of treating it honestly, seriously, and philosophically, yet I mean to pass away from all those who are seniors amongst us. I claim the privilege of speaking to juveniles as a juvenile myself. I have done so on former occasions--and, if you please, I shall do so again. And though I stand here with the knowledge of having the words I utter given to the world, yet that shall not deter me from speaking in the same familiar way to those whom I esteem nearest to me on this occasion.