Dr. Ayres of Hong-Kong relates several experiments he made in his own person to test the truth of the theory that the poisonous qualities of opium evaporate when it is smoked, but remain active when it is eaten. He began by absorbing a very small quantity per day till he could take as much as half-an-ounce, and says that he experienced sensations so intensely agreeable that he realized what the suffering of deprivation must be when the habit of opium-eating is once confirmed. He then tried smoking a pipe of the prepared drug every day, without feeling any ill effects whatever; there was, he declares, absolutely no difference in his pulse or in his temperature. It was exactly the same with several Europeans whom he persuaded to follow his example. "I counted the throbs of their pulse, I took their temperature, and there was absolutely nothing abnormal about either, although I had made them smoke twelve pipes each." This does but prove that the effects of opium are different with different constitutions, and that there are some who can take it even in large quantities with impunity; but for all that the horrors of the so-called black smoke, and of the opium dens of China can hardly be exaggerated, even the Celestials themselves admitting that the effects of the drug are injurious to health, and warp the better nature of those who indulge in it to excess; but, as already remarked, its price is still so high that only the wealthy can afford it in quantities likely to be hurtful. It is as difficult for a Chinese workman to get opium as it would be for a French peasant to buy champagne, or an English apprentice to indulge in port-wine. [Illustration: FIG. 43.--OPIUM PIPES.] [Sidenote: SOCIABLE SMOKERS]