reduced to a large extent to a fine powder, which so completely enveloped the ore itself when treated on the jig, or bump table, that no satisfactory separation could be made. After a number of fruitless attempts the bump table furnished two products, a slime, and the remainder of the ore. These were then treated by the spitzlütte of Rittenger, which in the end gave quite satisfactory results. The following table shows the final products both those of value and the waste. It explains itself.

Working of an Ore from Middletown, Ct., by Wm. R. Webster. (No abstract furnished.)

DEPARTMENT OF ARCHITECTURE.

Design for the buildings for a City Water Works. Abstract by the author, Amos J. Boyden.

The problem for solution in this thesis required designs for an Engine House and Stand Pipe Tower in the public park of a small city, together with such other buildings, or architectural adornments, as would be conducive to the convenience or pleasure of visitors to the park.

In the design, the plan of the engine house resolves itself into three parts, as follows:

1st, that part devoted to the government of the works, occupying the front of the building, and two stories in height. The principal rooms on the first floor of this part are, an office with adjoining ante-room, a visitors' room, a commissioners' room and a lavatory. These rooms are ranged along the main entrance hall, from which a stairway leads to the second floor, and to the basement.

On the second floor are five large well lighted rooms and a bath room. This floor is designed for the use of the resident engineer and his family.

2d. Part second of the building consists of the engine room and an adjoining boiler room, the floor of which is four feet lower than that of the engine room. A gallery runs around the engine room, access to which is gained from the first landing of the stairs from main hall to second floor.

3d. Wings one story in height extend from the engine room and from the boiler room to the retaining wall in the hill side, into which they run several feet. The boiler room wing is designed for a coal house, and is so situated that the coal may be dropped from the carts directly into the bins.

The engine house wing is divided into a machine shop and a carpenters' shop.

A chimney shaft 106 feet high is situated near the boiler room, on the axis of the plan.

The water is to be forced a distance of about 600 feet to the stand pipe tower, which is 160 feet high, 24 feet square at the base, and 20 feet square at the top. Adjoining the tower is a small gate honse.

The most architectural building in the park is a refreshment hall, containing waiting rooms for ladies and gentlemen, a hall for pleasure parties, and various smaller rooms shown on the accompanying plans. As in the engine house, wings extend to the retaining wall, the flat roofs of which give access to the

hall, while the rooms below may serve as ice house, and cellar, and the well lighted part as kitchen.

The required thickness of the retaining wall, 24 feet high, was calculated and found to be 7.65 feet at the base.

The roof trusses of the engine house are large primary trusses, composed of two wooden rafters, connected by an iron tie rod, the raf-* ters being supported by three small secondary trusses. The stresses in the various pieces of one of these trusses have been calculated. The required sectional area of the rafters was found to be 29.06 square inches.

Calculations were also made for the required indicated horse power of the engines.

DEPARTMENT OF CHEMISTRY.

Anthracene Pressings. Abstract by the author, Leonard P. Kinnicutt.

My thesis can be divided into the following principal topics: 1. Historical notice of the discovery of Anthracene.

2. Description of the manufacture of Anthracene.

3. Anthracene Pressings.

4. The partial separation of the Hydro-Carbons, which compose these pressings, into four principal products, by means of the difference of their solubility in alcohol.

5. The determination of Anthracene in the four products, by means of Suck's test.

6. Forming crystals, by treating each of the four products with a solution of picric acid.

7. The finding of Phenanthrene in the pressings.

8. The Phenanthrene colors and the value of Phenanthrene in the future.

9. The value of a quantitative test for Phenanthrene. 10. Testing the different methods by which it would seem possible to determine Phenanthrene quantitatively.

11. The comparison of the different methods, and the reasons for changing Phenanthrene into Phenanthrene Quinine, for the determination of Phenanthrene in this investigation.

12. The determination of Phenanthrene in the four differ ent products.

13. The general result of my work.

DEPARTMENT OF PHYSICS.

Report of a series of experiments made with a Holtz Machine. Abstract by the author, S. J. Mixter.

1. An account of previous measurements of electrical machines by Moscart and Rossetti.

2. The machine used in my experiments was made by Mr. E. S. Ritchie. It has a single plate 2 feet in diameter. The motor was a small high pressure steam engine, having a cylin der 2 inches in diameter, and 31 inches stroke. The work was measured by a form of dynamometer first used by Huyghens; the principle involved is, that the work transmitted through a belt equals the speed of the belt into one-half of the difference in the weights which balance on the two sides of the driven pulley. The strength of the current was measured by a galvanometer made from the secondary coil of a resistance coil, having a resistance of 6,313 ohms, and whose constant was accurately determined.

3. Various series of experiments were made to determine. the work converted into electricity.

(a.) Amount of work required to run the machine when discharged and charged, varying the length of the spark. (b.) On the absolute strength of this

amount of work converted into electricity.

current, and the From the results

obtained the electromotive force and interior resistance were calculated.

Curves representing the several series of observations are given.

DEPARTMENT OF SCIENCE AND LITERATURE.

The Empire of Austria. By Wm. A. Prentiss. Abstract.

Area and physical features; Component parts of the Empire; Ethnology; Vegetable and mineral products; Statistics of Commerce; Early history and growth of the Empire; Present constitution and government; Austria since Sadowa; Present position and prospects; List of authorities referred to

Switzerland. By James Liddell Arnott.

(Abstract not received.)