Second Term.

Zoology and Paleontology-Continued. Botany-Lectures on special subjects. Geology-Dana, Recitations and Lectures. Anatomy and Physiology-Academical Lectures. French-Selections.

Third Term.

Zoology and Paleontology—Continued, with Excursions. Photography—Practical Instruction.

7,-SELECT COURSE IN SCIENCE AND LITERATURE.

JUNIOR YEAR.

MODERN LANGUAGES.-French and German, continued. English Composition and Literature.

MATHEMATICS.-Peck's Mechanics, Norton's Astronomy.

NATURAL SCIENCE.-Agricultural Chemistry-Lectures. Zoology-Lectures and Excursions. Botany-Lectures and Excursions. Mineralogy-Lectures. Physical Geography-Lectures and Recitations.

HISTORY.-Recitations.

DRAWING.-Free Hand, and Architectural.

SENIOR YEAR.

LANGUAGE.-French or German, continued. Lectures on Language and Linguistic Ethnology. Compositions.

NATURAL SCIENCE.—Botany and Zoology, continued. Geology-Recitations and Lectures. Meteorology-Lectures. Human Anatomy and PhysiologyLectures.

Astronomy-Lectures.

PHILOSOPHY AND HISTORY.-Lectures and recitations, in History and Political Philosophy, International Law, Political Economy, Ethics and Metaphysics.

IL-PARTIAL COURSES LEADING TO NO DEGREES.

A partial course in Agriculture, occupying seven months in the winter, is arranged for the convenience of those who cannot pursue a longer course of study.

Special students desirous to become proficient in some branch of Chemistry are also received in the Chemical Laboratory.

In Natural History arrangements are also made for the instruction of special students, not candidates for degrees. The same is true in Practical Astronomy. No formal examinations are required for admission to these advantages, but they are only offered to young men who are able and disposed to be faithful in the pursuit of the courses they select.

III. HIGHER COURSES LEADING TO THE DEGREE OF DOCTOR OF PHILOSOPHY OR OF CIVIL ENGINEER IN YALE COLLEGE.

A higher course in Civil Engineering is arranged to follow the regular three years' course, and those who pursue it faithfully may receive the degree of Civil Engineer. (C. E.)

Candidates for the Degree of Ph. Dr. must have taken already a Bachelor's Degree, and must pursue in this College, a course of two years' instruction in the higher studies of at least three departments of science, terminating with a satisfactory examination.

PLANS AND DESCRIPTION OF SHEFFIELD HALL, OF THE SHEFFIELD SCIENTIFIC SCHOOL, YALE COLLEGE, NEW HAVEN, CONN.

Sheffield Hall is situated in Grove street, fronting College street, nearly a quarter of a mile north of the College square. It is bui.t of stone and brick covered with stucco, and consists of a principal three story structure, and two wings (each of two stories,) now connected in the rear by another three story building. There are three public entrances on Grove street, of which the central one is the chief, leading to all portions of the building; the eastern door leads to the principal room of the Engineering Class and to the Metallurgical Museum above it; and the western door leads to the Chemical Laboratory.

There are two projecting towers-one in front, at the main entrance, and one at the northwest corner of the building. The principal tower in front is ninety feet high and sixteen feet square. In the second and third stories are studies for two of the professors. Above these rooms is the belfry-clock with its four dials, and surmounting the structure is a revolving turret in which the equatorial telescope is placed.

16 3, Exhibition-room for engineering models, etc.

"18, Drawing room for the Engineering and other classes.

"19, Chemical Assistant's Office. 20, 20, Chemical Laboratory.

L, Closet.-P, Balance-room.-Q, Store room.-R, Chemical reagent room.

The northwestern tower, sixteen feet square and fifty feet high, was built for the reception of a Meridian Circle.

The extreme length of the edifice from the western tower to the east side is 117 feet; and the extreme depth is 112 feet. The three cuts which are given herewith exhibit the arrangement of rooms on each of the three stories. The basement, which is not here epresented, contains a Janitor's apartment, and a metallurgical laboratory, in addition to the hot-air furnaces, store rooms, etc.

The Observatory occupies the two towers, each sixteen feet square, recently added to the edifice. In one of these is mounted an EQUATORIAL TELESCOPE; in the other, a MERIDIAN CIRCLE, with a SIDEREAL CLOCK; both telescope and circle being the recent gifts of Mr. Sheffield.

"10, Agricultural Lecture-room.

"11, Chemical Lecture-room.

"12, Private Chemical Laboratory.

"13, Study-Professor of Mineralogy and Metallurgy.

G, Study-Professor of Analytical and Agricultural Chemistry.

The Equatorial Telescope, ordered of Messrs. Alvan Clark & Sons, of Cambridgeport, in November, 1865, was, early in October last, mounted in the revolving turret at the top of the front tower, some eighty feet above the ground, where it commands a good horizon. It is supported by a freestone pier, six feet in height, which stands on a massive floor of masonry arched in from the side walls, just above the tower clock. Though it thus partakes of whatever motion the tower itself is subject to, from winds and other causes, no noticeable inconvenience has been experienced, or is anticipated, from this source. The floor of the room, which is of wood, immediately above the stone floor, rests only in the outer walls, and does not touch the pier.

The object-glass has a clear aperture of nine inches, and is nine feet ten inches in focal length. The tube, made of pine handsomely finished, and ten inches in diameter, is at once stiff and light. Seven Huygenian eye-pieces give powers ranging from 40 to 620. All but one of these fit also a diagonal eyetube containing a prismatic reflector. Another diagonal reflector-the first surface of an acute prism of glass-is used in observing the sun, the greater part

of whose light and heat is transmitted, while the image formed by the reflected rays is viewed without inconvenience, with the full aperture of the telescope.

The equatorial mounting is the German, or Fraunhofer's-the declination axis carrying a circle of twelve inches diameter, graduated on silver so as to read by two verniers to 10", and the polar axis carrying an hour circle of nine inches diameter, graduated to minutes of time, and reading by two verniers to five seconds.

Beneath the polar axis, in the curve of the U-shaped iron piece by which that axis is supported, is placed the driving clock. Its going is regulated by a half-second pendulum, and the intermittent motion of the scape wheel is changed into a smooth and equable motion for the telescope by the simple and ingenious device known as "Bond's Spring-Governor."

The performance of the telescope accords with the reputation of its makers. On favorable nights, it shows easily such test objects as Cygni, the companion of Sirius, the 6th star in the Trapezium of Orion, and, with more difficulty, Y 2 Andromeda. The second and third have been seen with the aperture reduced to five inches.

There is used with the telescope a bi-filar position-micrometer, with four eyepieces, by Dollond.

A very simple observing chair enables the observer to change his position, quickly and easily, to any height required, without leaving his seat.

The revolving turret, resembling in form that of a "Monitor," rests, by a circular rail at its base, on eight grooved iron wheels, nine inches in diameter, the steel journals of which run in boxes of Babbitt's metal. It is turned by a crank, the pinion of which gears into a rack cast on the circular rail. The opening, three feet in width, extends entirely across, through the roof and sides, from base to base. It is closed by eight hinged shutters, so controlled by rods and levers as to be opened or shut with great facility.

The tower connected with the west wing was erected during the last summer, specially for the reception of the Meridian Circle purchased of the U. S Government and formerly used in the East room of the Washington Observatory. This instrument was mounted in September on the massive granite piers, which came with it, and the bases of which are imbedded in the upper part of a shaft of solid masonry, thirty-six feet in height, nine in diameter at the base, and seven at the top. This shaft rises, independently of the building throughout, from a foundation ten feet below the surface of the ground, and is surrounded, at a few inches distance, by a double casing made of tarred felt and matched sheathing boards. It is thus well protected against sudden changes of temperature.

The Meridian Circle has a five-foot telescope, with an object glass of 38 inches aperture, and 58 inches focal length. It has three Ramsden eye-pieces. A diagonal eye-piece in addition has been ordered, for more conveniently observing objects at high altitudes. At the focus is a system of one horizontal, and eleven vertical, spider-lines, together with a micrometer thread movable in declination only. The mean equatorial interval of the vertical threads is 148.167.

The axis, thirty inches in length, terminates in steel pivots two inches in diameter, and to opposite faces of its central cube are bolted the two conical frusta forming the tube of the telescope. This tube is so constructed at the