The church is built of Concord granite in light gray, with trimmings of the pink granite of New Hampshire, Mrs. Eddy's native State. The architecture is Romanesque throughout. The tower is 120 feet in height and 21-1/2 feet square. The entrances are of marble, with doors of antique oak richly carved. The windows of stained glass are very rich in pictorial effect. The lighting and cooling of the church--for cooling is a recognized feature as well as heating--are done by electricity, and the heat generated by two large boilers in the basement is distributed by the four systems with motor electric power. The partitions are of iron; the floors of marble in mosaic work, and the edifice is therefore as literally fireproof as is conceivable. The principal features are the auditorium, seating 1,100 people and capable of holding 1,500; the "Mother's room," designed for the exclusive use of Mrs. Eddy; the "directors' room," and the vestry. The girders are all of iron, the roof is of terra cotta tiles, the galleries are in plaster relief, the window frames are of iron, coated with plaster; the staircases are of iron, with marble stairs of rose pink and marble approaches. The vestibule is a fitting entrance to this magnificent temple. In the ceiling is a sunburst with a seven-pointed star, which illuminates it. From this are the entrances leading to the auditorium, the "Mother's room," and the directors' room. The auditorium is seated with pews of curly birch, upholstered in old rose plush. The floor is in white Italian mosaic, with frieze of the old rose, and the wainscoting repeats the same tints. The base and cap are of pink Tennessee marble. On the walls are bracketed oxidized silver lamps of Roman design, and there are frequent illuminated texts from the Bible and from Mrs. Eddy's SCIENCE AND HEALTH WITH KEY TO THE SCRIPTURES impaneled. A sunburst in the centre of the ceiling takes the place of chandeliers. There is a disc of cut glass in decorative designs covering 144 electric lights in the form of a star, which is twenty-one inches from point to point, the centre being of pure white light, and each ray under prisms which reflect the rainbow tints. The galleries are richly paneled in relief work. The organ and choir gallery is spacious and rich beyond the power of words to depict. The platform--corresponding to the chancel of an Episcopal church--is a mosaic work, with richly carved seats following the sweep of its curve, with a lamp stand of the rennaissance period on either end, bearing six richly wrought oxidized silver lamps, eight feet in height. The great organ comes from Detroit. It is one of vast compass, with æolian attachment, and cost $11,000. It is the gift of a single individual--a votive offering of gratitude for the healing of the wife of the donor. The chime of bells includes fifteen, of fine range and perfect tone. THE "MOTHER'S ROOM."