signs of distortion, checking, cracking or disintegration.

The cement shall contain not more than 1.75 per cent anhydrous sulphuric acid or more than 4 per cent magnesium oxide.

A test of the neat cement must be made with each mortar series for comparison of the quality of the typical Portland cement.

A. PHYSICAL TESTS IN LABORATORY:

1. Tensile strength with one part cement to varying percentages of material under test for 7, 28, 90, 180 and 360 days;

2. Compressive strength with one part cement to varying percentages of materials under test for 7, 28, 90, 180 and 360 days;

3. Transverse strength with one part cement to varying percentages of material under test for 7, 28, 90, 180 and 360 days;

4. Yield in mortar;

5. Tensile strength with cement, material sieved to one size, 7, 28, 90, 180 and 360 days;

6. Compressive strength with cement, material sieved to one size, 7, 28, 90, 180 and 360 days; 7. Transverse strength with cement, material sieved to one size, 7, 28, 90, 180 and 360 days; 8. Porosity;

9. Permeability.

III. Tests of concrete made with stone, stone screenings, gravel, sand, cinder, slags, etc.:

A. PHYSICAL TESTS IN LABORATORY:

1. Tensile strength with different mixtures as to proportion and size of the aggregates for 30, 90, 180 and 360 days.

2. Compressive strength with different mixtures as to proportion and size of the aggregates for 30, 90, 180 and 360 days;

3. Transverse strength with different mixtures as to proportion and size of aggregates for 30, 90, 180 and 360 days.

4. Absorption.

5. Weight per cubic foot.

6. Modulus of elasticity in compression and tension.

7. Character crushed material used;

(a) Weight per cubic foot,

(b) Size,

(c) Percentage of voids,

(d) Percentage of silt.

8. Porosity;

9. Permeability;

10. Fire resisting qualities;

(a) Effect on hardening concrete,

(b) Effect on hardened concrete.

11. Freezing tests;

12. Yield of concrete;

13. Effect of vibration;

(a) On hardening of plain and reinforced

concrete,

(b) On hardened plain and reinforced con

crete.

14. Protective influence against corrosion of metal; 15. Adhesion of concrete to metal for varying periods, under varying conditions, up to at least three years;

(a) Embedded,

(b) On flat surfaces.

B. FULL SIZE TESTS:

1. Beams of various spans, sections and composi

tions;

2. Building blocks and bricks as to:

(a) Compressive strength, wet and dry mixtures,

(b) Transverse strength, wet and dry mix

tures,

(c) Shearing strength, wet and dry mix

tures,

(d) Absorption, wet and dry mixtures,

(e) Permeability,

(f) Methods of waterproofing,

(g) Fire resisting qualities,

(h) Efflorescence.

IV. Tests of reinforced concrete: Beams.

A. PHYSICAL TESTS IN LABORATORY:

1. Varying percentages of round, square and flat bars in bottom,

2. Varying percentages round, square and flat bars in bottom and top.

Approved by the advisory board June 3, 1905.

CHARLES B. DUDLEY, President.

RICHARD L. HUMPHREY, Secretary.

DISCUSSION.

MR. WILLIAM L. HALL: The Bureau of Forestry stands with the Geological Survey in certain tests along this line. In its work on the preservative treatment of wood, and the testing of structural timbers, the bureau is dealing with the same problems to which this Society has given its attention.

With its work in the testing of timbers most of you are already acquainted through the report given at the last meeting of this Society by Professor Hatt. The program which he presented to the Society two years ago, and which the Society has printed as a special paper, is being carried out with very little modification. Work will be carried forward from this time in six laboratories located at convenient points. Much attention is also being given by the bureau to the treatment of wood to make it last as long as possible. There is no doubt but that in wood properly treated the question of decay is practically eliminated. The important problems therefore in this work are:

1. What preservatives shall be applied under given conditions?

2. How are the preservatives to be most efficaciously applied?

3. The question of decay under control-how can timbers best be protected against mechanical wear?

The bureau will work on these problems by much the same system adopted for its timber tests. It will establish experimental plants wherever necessary on its own account, and in addition will carry on experiments in coöperation with railroads and other companies which operate treating plants.

In connection with its timber tests and preservative treatments, the bureau will go further and study the properties of different woods which particularly adapt them for special uses. It is just now beginning a study of woods for cooperage purposes, for vehicles and implement manufacture, for box boards and for paving blocks. The study will be extended later to other classes of wood.

Our hope is to reach that point where each of our commercial timbers can be so handled and used that it will give the greatest service it is capable of giving. In all of this work the Bureau desires to the fullest extent the counsel and coöperation of engineers who are interested in the results.

PROFESSOR GAETANO LANZA: In this connection it appears to me that it might be of interest to the members of this Society to learn of a piece of information I obtained a short time ago regarding another government department, namely, the Watertown Arsenal. I understand that there is great probability that instead of waiting until the end of the year before publishing the results of the tests made there, bulletins will be issued soon after the tests are made. I should suppose, if such a thing be done, that the bulletins would be distributed to persons especially interested in such tests.

MR. R. W. LESLEY: Referring to the point made by Professor Lanza, we all know that the government publishes a great deal of valuable information, and that much of that valuable information is buried. We real

ize that if this advisory board, and laboratory operated under its advice, is backed and sustained by the scientific societies of the country and by the money of the government, we shall have a means of circulating most valuable information to these people to whom that information will be of use. In other words, while we are all opposed to trusts for money making, I consider this a great big trust for information-information not for one but for all. I sincerely believe it is the beginning of one of the great institutions of this country—a big engineering experiment station.