And now the question arises, what _is_ a stimulant dose? How much tobacco can a man take daily with benefit to himself? The reply is obvious, that no universal rule can be given. In dealing with the science of life, to indulge in sweeping statements and glittering generalities is the surest mark of a charlatan. Mr. Parton says, with reference to alcohol, that he devoutly wishes the thing could be proved to be, always, everywhere, under any circumstances, and in any quantities, injurious, (p. 59.) If this could be proved, alcohol would be shown to be a substance all but unique in nature. So much as this cannot be said of arsenic, prussic acid, or strychnine. Science cannot be made to harmonize with the exaggerations of radicalism. With regard to tobacco, every man, moderately endowed with common sense, can soon tell how much he ought to take. The muscular tremour of narcosis is unmistakable, and a depressed or fluttering pulse is easily detected. When a man has smoked until these symptoms are awakened, let him stop short,--he has gone too far already. Let him take good care never to repeat the dose. The true Epicurean, to whom [Greek: mêden agan] has become second nature, who knows how to live, and who is instinctively disgusted by vulgar excess, will not be likely to oversmoke himself more than once. So much we say, in view of the impossibility of laying down universal rules. But it is well for the smoker to bear in mind that the more gradually the nicotine is absorbed into his circulating system, the better. For this reason a pipe, with porous bowl and long porous stem, is better than a cigar,[29] which is besides liable by direct contact to irritate the tongue and lips. And, likewise, it is better to smoke mild tobacco for an hour than strong tobacco for half an hour. Probably four or five pipes daily are enough for most healthy persons; but no such rule can be quoted as inflexible or infallible. Some persons, as we have said, are never stimulated by tobacco, and therefore ought never to smoke at all. Others can take relatively large quantities with little risk of narcosis. Dr. Parr would smoke twenty pipes in a single evening. The illustrious Hobbes sat always wrapped in a dense cloud of smoke, while he wrote his immortal works; yet he lived, hale and hearty, to the age of ninety-two. [29] The cigar is, however, usually made of milder tobacco. And an old pipe, saturated with nicotinous oil, may become far stronger than any ordinary cigar.