Church Manual of The First Church of Christ, Scientist in Boston, Massachusetts, 1910, 88th Edition
by Mary Baker Eddy
The 88th Edition is Mrs. Eddy's approved text. The 89th Edition has changes made by the Boston Board of Directors without Mrs. Eddy's approval, hence the reason we do not carry it or use it.
On page 148 of Miscellaneous Writings, Mary Baker Eddy gave her own explanation of the Church Manual:
Extract From A Letter
The Rules and By-laws in the Manual of The First Church of Christ, Scientist, Boston, originated not in solemn conclave as in ancient Sanhedrim. They were not arbitrary opinions nor dictatorial demands, such as one person might impose on another. They were impelled by a power not one's own, were written at different dates, and as the occasion required. They sprang from necessity, the logic of events, — from the immediate demand for them as a help that must be supplied to maintain the dignity and defense of our Cause; hence their simple, scientific basis, and detail so requisite to demonstrate genuine Christian Science, and which will do for the race what absolute doctrines destined for future generations might not accomplish.