PREFACE V 



the minds of boys and girls in a proper manner, adds 

 greatly to the interest and value of the work, as there 

 seemed to be a deficiency in this particular in the former 

 editions. J. H. K. 



Battle Creek, IMich., 



October, 1879. 



PREFACE TO ENLARGED EDITIONS 



Since the preceding paragraphs were written, 

 nearly one hundred thousand copies of this work have 

 been placed in the hands of interested readers in vari- 

 ous parts of the United States. One large edition has 

 followed another with such rapidity that the plates 

 became considerably worn, and the book has been 

 entirely reset, and several new chapters have been 

 added. 



Both the author and the publisher desire to express 

 to the reading public their sincere thanks for the gen- 

 erous support which has been accorded their efforts 

 in behalf of popular education upon a subject so uni- 

 versally ignored and tabooed. The wall of prejudice, 

 which in the early years of the introduction of this 

 work threatened to present a serious obstacle to its 

 usefulness, has been gradually broken down, and there 

 is evidence among the more intelligent class of people 

 of an increasing sentiment favoring the frank and open 

 consideration of the subjects herein presented. 



December, 1885. J. H. K. 



Note. — After the sale of nearly two hundred thousand copies of 

 this work, it is still in demand. In the preparation of this edition, 

 much valuable matter has been added, considerably enhancing the value 

 of the work which has already received so cordial a welcome from 

 the reading public. 



J. H. K. 



January, 1894. 



