Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. This treatise issued from the press in May, 1921, and was accorded an exceedingly cordial reception by the reviewers, both in Lutheran journals of every Synodical connection and in the organs of other Christian denomina tions. During the’past six months the discussion of evolution has entered the forefront of interest among the American people, and the monthly magazines and Sunday papers, quickly sensing the popular demand, have printed countless articles and editorials on the subject. It was fortunate for our book that it found a market so well prepared for it. The publisher has now requested that the text be revised and brought up-to-date wherever necessary, as a second edition is about to issue. Aside from the correction of a few typographical errors no changes have been made in the text matter. However, an index of subjects and authors has been added and in an appendix the most recent phase of the controversy has received attention.