Original (inglés)

FOREWORD Since I am permitted to consider myself in some way responsible for this narrative's being put on record, it is with the very heartiest good will that I accept the publishers' kind invitation to write a brief foreword to it. I have, during twenty years, been working against a problem that I recognized called for all--yes, and more, than--I had to give it. For I have been endeavoring, through my own imperfect attainments, to translate into undeniable language on the Lab