Beam section. In the beam section there have been made approximately 600 beams of plain and reinforced concrete, 8 inches wide, 11 inches deep, and 13 feet long; 600 six-inch cubes; 800 cylinders 8 inches in diameter and 16 inches long; and 110 bond specimens 8 inches in diameter and of varying lengths. Of these, there have been tested 290 beams, 280 cubes, 390 cylinders, and 40 bond test pieces. In addition to these about 2,500 steel tests have been made, and the modulus of elasticity has been determined on 250 of these. Building-block section.-About 1,600 building blocks of standard size and 400 cylinders 8 inches in diameter and 16 inches long have been made, and of these 1,150 blocks and 200 cylinders have been tested.

Chemical section.-About 550 chemical analyses have been made.

FUTURE WORK.

The appropriation of $100,000 available for the fiscal year beginning July 1, 1907, insures a continuance of the work. Many new series, some of which have been outlined in this report, have been begun and will be continued during the coming year.

In addition to the work at these laboratories many tests are being made at technological institutions in cooperation with the United States Geological Survey, among which may be mentioned Columbia University, the University of Illinois, Purdue University, and the University of Wisconsin, the purpose of this cooperative work being to avoid all unnecessary duplication in work or unnecessary expenditures for equipment the temporary use of which could be obtained elsewhere.

The results of the tests are being rapidly worked up into reports for publication, which will be issued in bulletin form, each treating of a particular phase of the work at the structural-materials laboratories.