cast-iron snow-guards. The roof of the main body is what is termed a hipped roof, pitched from each side towards the middle of the building. The main roof is truncated about thirty feet back from the face of the outer walls, above which is a flat, occupying a space about seventy feet by eighty-four feet, and which is surrounded by a wooden balustrade. On the middle portion of the flat roof stands an octagonal structure, thirty feet in diameter, which, in connection with the roof, is designed to be used as an observatory for astronomical observations. The main shaft of the ventilator passes up through the center of the observatory, and terminates above the same in an octagonal cupola, thirty-seven feet high from its base up to the ball of the vane. The body of the cupola is thirteen feet in diameter, and fifteen feet high; in each face is an outlet for air, three feet wide by eight feet high.

In the westerly corner is the chemical lecture-room, forty-four feet by fortyfive feet; around three sides of this room are tables placed about five feet away from the walls, and fitted up with all of the requisite apparatus and appliances,

at which, and with which pupils may perform experiments. On the fourth side of the room is the lecturers' platform and table; in the middle of the room are settees for seating the class. On the northerly side of and adjoining the lecture-room is a laboratory, sixteen feet by thirty feet. On the easterly side of the lecture-room is a cabinet for minerals, sixteen feet by thirty feet. Adjoining the inner end of the cabinet is a passage and staircase leading to the story above. In the northerly corner is the boiler-room, thirty feet by fortyfive feet, in which are three boilers, each three feet six inches in diameter, by sixteen feet long, which supply the steam for heating the building. The room for coals occupies the space between the outside of the building and the line of the street, of the width of the boiler-room, and out to the curbstone under the sidewalk on the Pembroke street side. At the southerly end of the boilerroom is a room for the janitors, sixteen feet by twenty-four feet. On the easterly side of the boiler-room are the water-closets, twenty-two in number, for the High and Normal departments, occupying a space between the side of the

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boiler-room and side of corridor, about thirty feet wide, and fifty feet long, with efficient means of ventilation. The remainder of the space in the north-westerly half of the building is occupied by the central hall, and a staircase at the Pembroke street end of the corridor.

The whole of the south-easterly half of the basement is devoted to a Model School, with accommodations for about one hundred and fifty primary, and the same number of grammar school pupils. The entrance, cloak-rooms, waterclosets, and all other accommodations for this department, are separate and distinct from those of the other departments. The accommodations consist of a large class-room in each of the two corners of the building, each thirty feet by forty-five feet; connected with each class-room are two smaller rooms, each about sixteen feet by twenty-five feet. The remainder of the space is devoted to cloak-rooms. water-closets, hall and passages.

There are two entrances above the basement, one in the centre of each street front, and approached by flights of stone steps fourteen feet broad, which lead

up to a vestibule on the Newton street side, two feet four inches below the first floor, and on the Pembroke street side, about five feet below the floor.

There are four finished stories, including the basement, which is twelve feet high; the first and second stories are each fourteen feet high; the large hall in the third story is eighteen feet six inches high, the balance of the story is fifteen feet high.

A corridor twelve feet wide extends across the building from the middle of the Newton street or south-westerly side, to the middle of the Pembroke-street or north-easterly side, at the ends of which are the entrances before described, and the staircases leading to the upper stories.

In the middle of the building is a central hall twenty-two feet wide by sev enty-seven feet long, crossing the corridor at right-angles; at each end of the hall are two rooms thirty feet long, which, with the hall, occupy the entire length of the building. The hall and corridor divide the building into four equal sections or quarters, which are subdivided as follows: At the left of the

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entrance on the Newton street, or south-westerly side, is a reception room sixteen feet by twenty-two feet, which is furnished in an appropriate manner with black walnut furniture, and the walls adorned with a portrait, and a bas-relief profile in marble of the late former master, Wm. H. Seavey, and other works of art. Beyond the reception-room is a passage leading from the corridor to the master's room, which is fourteen feet by twenty-seven feet, neatly furnished, and the walls lined with bookcases; this room is connected with the receptionroom, and with a room thirty feet by forty-five feet, for the advanced class occupying the westerly corner of the building. The inner portion of this quarter of the building is occupied by a passage leading from the hall to the advanced class-room and master's room; a staircase leading down to the basement story, a cloak-room for the advanced class, master's closets, and the ventiduets for this quarter of the building. At the end of the central hall, and occupying the middle portion of the north-westerly side, are two rooms, each sixteen feet by thirty feet, one of which was designed for a library; the other is a recitation-room. In the northerly corner is a class-room thirty feet by forty-five feet; at the south-easterly side of the class-room is a recitation-room sixteen feet by thirty-two feet, between the inner end of which and the central hall is a large, brick foul-air shaft and chimney, and a passage leading to the classroom, recitation-room, and cloak-room in this quarter of the building. At the right of the entrance on the Pembroke street side is a dressing-room fourteen feet by twenty-four feet, for female teachers, at the inner end of which, and occupying the remainder of the space in this quarter, is a cloak-room fourteen feet by twenty-five feet. At the left of the Pembroke street entrance is a reci tation-room sixteen feet by twenty-eight feet, in the easterly corner a classroom forty-four feet by forty-five feet, adjoining which, on the southerly side, and at the end of the central hall, is another recitation-room seventeen feet by thirty feet. The remainder of this quarter is occupied by a cloak-room sixteen feet by twenty-one feet, occupying the space between the side of the central hall and inner end of recitation-room at the left of entrance, and a space about seven feet by fourteen feet, lying between the class-room and hall, and the cloak-room and recitation-room at the end of the hall. The ends of this space are occupied by the ventiducts for this quarter of the building; through the middle is a passage leading from the hall to the class-room. The southerly quarter of this floor has the same amount of accommodations, and is arranged precisely like the easterly quarter last described; and further, the same arrangement is carried through the three stories above the basement in the southeasterly half of the building, and the westerly quarter of the second story; that is to say, a class-room, two recitation-rooms, and a cloak-room, in each quarter, as above described.

The northerly quarter of the second story contains a class-room thirty feet by forty-five feet, with two recitation-rooms, a cloak-room, teachers' dressingroom, etc., as in the northerly quarter of the first story.

The westerly quarter of the third story is devoted to an assembly hall, about sixty-two feet wide by seventy-four feet six inches long. In the northerly quarterly of the third story is a room for drawing, thirty feet by forty-five feet; a cabinet for apparatus, sixteen feet by thirty-two feet; a teachers' dressingroom, cloak-room, etc., as in the same quarter in the stories below.