adapting oral lessons from advanced works on this theme, but now, the average primary teacher brings to this study no experience, and limited previous study.

To meet this need, this work has been prepared. Technical terms have been avoided, and only such facts of physiology developed as are necessary to the treatment of the effects of alcohol, tobacco, opium, and other truths of hygiene.

To the children in the Primary Schools of this country, for whom it was prepared, this work is dedicated.