ILLUSTRATIONS.
| Group of Opium Smokers | [Frontispiece] |
| Facing page | |
| An Excessive Opium Smoker | [40] |
| Opium Smokers’ Appliances | [46] |
| Preparing to Smoke Opium | [48] |
| Chinaman Smoking Opium | [50] |
| Group of Morphia Injectors | [58] |
| An Indian Morphinist | [62] |
| A Burman Cocaine Eater | [72] |