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remainder of the structure is lighted by automatically controlled electricity, and the whole is well ventilated mechanically. The materials of the construction are steel and castiron framework, steel shelves, and white marble decks, arranged similar to the preyious and original stacks in the building. Three automatic electric elevators and three stairways are provided from basement to attic, and also pneumatic tube communication from the shelving to the main reading rooms.

About 336,000 cubic feet of the space is shelved for bound volumes of newspapers and the remainder for other books of various sizes and dimensions. As in the other stacks of the Library, the accommodations for books are of the widest possible range and extent of adjustability. Like the remainder of the building, the roof is of steel, terra cotta, and sheet copper.

The original masonry walls of the court formed the room in which the shelving comprising the new stack was built, as has been done in many other rooms of the building to meet the increasing demands for shelving since its first occupation by the Library thirteen years ago.

The building of this stack was begun in the fall of 1908 and essentially completed, excepting a machine book carrier, in March, 1910.

The total appropriation for the stack was $310,000, of which $301,466.42 has been expended.

The stack contains 118,314 feet of shelving for books and 114,055 feet of shelving for newspaper volumes, a total of about 44 miles of shelving in all.

It will thus accommodate about 946,000 volumes of books and 94,000 volumes of newspapers.

MUSIC BOOK STACK

Near the close of the fiscal year designs and provisions were made for the construction of the permanent stack for shelving the more important parts of the collection of music in the Division of Music, located on the ground floor of the north curtain of the building. This construction, mainly of cast iron and steel, is under way now and nearly finished. In connection with this stack other space is being prepared for music storage in the basement thereunder.

CONNECTION TO CENTRAL POWER PLANT

Tunnel, pipe, electric cable and transforming communication has recently been installed at the Library for the service of the new central heating and power station to government buildings on Capitol Hill. One of the two original batteries of eight steam boilers has been removed to make way for this improvement.

APPROPRIATIONS AND EXPENDITURES

In addition to the appropriations for the Library, this office is charged with the disbursement of the appropriations for the United States Botanic Garden, and any others placed under the control of the Joint Committee on the Library.

The following table presents the several appropriations accordingly disbursed during the fiscal year and the corresponding appropriations for the preceding and succeeding years:

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a Including deficiency appropriation of $312 and increase of $505.97 by sale of cards.

b Including deficiency appropriation of $500 and increase of $444.30 by sale of cards.

c Including $76 for services performed in June, 1908.

d Including balance available from preceding year.

e Including credit of $31.46 from sale of stationery supplies to Library building and grounds.

f Including unfilled orders.

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UNEXPENDED BALANCES

All claims for the fiscal year 1908 have been settled, including those paid on auditor's certificate, and the unexpended balances of the appropriations have been deposited to the credit of the surplus fund of the Treasury, in amounts as follows.

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