writers, clearest thinkers, and greatest scholars do not regard the use of alcohol as essential to thinking, and very few find tobacco an aid. With one or two exceptions, the writers take care to minimise the dangers incurred in the use of stimulants. Though they smoke, they smoke the weakest tobacco; though they drink, they drink only at meals. They work in the day time, take plenty of out-door exercise, and rest when they are tired. Many regard tobacco as a snare and a delusion; and all regard it as unnecessary for the brain of the youthful student. The greatest workers and thinkers of the middle ages, Dr. Russell remarks, never used it; [Footnote: Homer sang his deathless song, Raphael painted his glorious Madonnas, Luther preached, Guttenberg printed, Columbus discovered a New World before tobacco was heard of. No rations of tobacco were served out to the heroes of Thermopylae, no cigar strung up the nerves of Socrates. Empires rose and fell, men lived and loved and died during long ages, without tobacco. History was for the most part written before its appearance. "It is the solace, the aider, the familiar spirit of the thinker," cries the apologist; yet Plato the Divine thought without its aid, Augustine described the glories of God's city, Dante sang his majestic melancholy song, Savonarola reasoned and died, Alfred ruled well and wisely without it. Tyrtaeus sang his patriotic song, Roger Bacon dived deep into Nature's secrets, the wise Stagirite sounded the depths of human wisdom, equally unaided by it Harmodius and Aristogeiton twined the myrtle round their swords, and slew the tyrant of their fatherland, without its inspiration. In a word, kings ruled, poets sung, artists painted, patriots bled, martyrs suffered, thinkers reasoned, before it was known or dreamed of.--_Quarterly Journal of Science_, 1873.] and Mr. Watts thinks that its introduction by civilised races has been an unmixed evil. It is a remarkable fact that out of 20 men of science, only two smoke, one of whom, Professor Huxley, did not commence until he was forty years of age. Even among those who smoke there is a considerable difference in the times chosen for smoking. Though the Rev. A. Plummer declares himself a firm believer in the use of tobacco, he smokes _before_ work, _after_ work, rarely while at work. Mr. Wilkie Collins smokes after work, and Mr. James Payn smokes all the time he is working. Mr. Francillon's consumption of tobacco, and his power of work, are in almost exact proportion. Similar testimony comes from Mark Twain. Assuming that the prince of American humorists is not joking, his experience of cigar-smoking is unique. When Charles Lamb was asked how he had acquired the art of smoking, he answered, "By toiling after it as some men toil after virtue." I hope that young smokers will not conclude that by following the example of Mark Twain, their brain will become as fertile as his. To them tobacco is bad in any form. It