So, why a reprint of a book over 135 years old when there are so many reprints and new editions of the text? Excellent question and one I will endeavor to answer here. Since it is our goal to find and reprint spiritual classics on the verge of falling into the vast abyss, we came upon reference to this work while reading Lifting the Veil by Lillian Dewaters, and the following is quoted verbatim from The Sickle by William W. Walter, during a discussion on the understanding of Christian Science, excerpted from pages 127-129, 1918 edition. 

Recently there has arisen a misunderstanding among the students of Christian Science, regarding the correctness of the early editions of Science and Health, with Key to the Scriptures. Some maintain that merely reading the early editions once gave them a much greater depth of understanding, and consequently greater healing power than years of study spent upon the later editions. Others maintain that Christian Science, in its complete purity, is not to be found in the early editions, and further state that Mrs. Eddy later repudiated these early editions as being incorrect in Principle. Mrs. Eddy's own words ought to be the best authority on this question. She wrote, page 55, "Retrospection and Introspection", under the chapter heading of "The Precious Volume" - "The first edition of my most important work, Science and Health, containing the complete statement of Christian Science, the term employed by me to express the Divine, or spiritual Science of Mind-healing was published in 1875." The statement, "the first edition of my most important work, Science and Health, containing the complete statement of Christian Science'' was undoubtedly written in 1891, or 16 years after: the publishing of the first edition. Thus we see that after 16 years of teaching, writing, and practice Mrs. Eddy still maintained that the first edition was "The Precious Volume" and the one that contained "the complete statement of Christian Science".