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Transcriber’s Notes

Obvious typographical errors have been silently corrected. Variations
in hyphenation and accents have been standardised but all other
spelling and punctuation remains unchanged.

Footnotes are located at the end of the book.

Italics are represented thus _italic_, bold thus =bold=, spaced thus
+spaced+ and superscript thus a^x.




[Illustration: Japanese smokers.]


                                  THE

                             SEVEN SISTERS

                                  OF

                                SLEEP.


                POPULAR HISTORY OF THE SEVEN PREVAILING
                        NARCOTICS OF THE WORLD.


                                  BY

                             M. C. COOKE,

            DIRECTOR OF THE METROPOLITAN SCHOLASTIC MUSEUM.
