The course in natural and experimental philosophy begins with and continues throughout the third academic year. Mechanics is studied during the first term. The text used is Gordon’s _Mechanics_. Many of the principles are illustrated by apparatus in the lecture and section rooms, and the students are required to repeat and explain these experiments. The course aims to be as complete as possible with the limitation that it can be properly covered in a term of about 90 to 100 days by students having a proficient knowledge of the calculus; the treatment is sufficiently mathematical to furnish a confident basis for advanced work in the technical staff after graduation. During the second term about 120 lessons are allotted to this department. The first half of this time is devoted to the subjects of sound and light. The authorized textbook is Gordon’s _Sound and Light_. Astronomy is studied in the remainder of the second term. The text used are Young’s _General Astronomy_ and Michie and Harlow’s _Practical Astronomy_. The principal aim of this course, in addition to its important value in educational development, is to furnish an ample basis for the establishment of stations in explorations and surveys. The class attends daily throughout the year, except eight days, during which half the class attends daily. TEXTBOOKS Sound and Light. Gordon. Mechanics. Gordon. General Astronomy. Young. Practical Astronomy. Michie and Harlow. Numerous standard works on the general subjects covered by the course are available for reference. DEPARTMENT OF MATHEMATICS THIRD AND FOURTH CLASSES The course in mathematics begins with the fourth-class year and continues through the third-class year. In the fourth-class year, algebra is completed in alternation; first with geometry, then with trigonometry. Plane analytical geometry is begun. In the third-class year, plane and solid analytical geometry and descriptive geometry are completed in alternation. The calculus and least squares finish the course. The course in algebra covers the entire subject as generally taught in colleges, but the student is expected to have already mastered elementary algebra to include the progressions and the solution of the quadratic equation. The course in elementary geometry includes the books that relate to the plane and those that relate to space, but the student is expected to have mastered the former. Plane and spherical trigonometry includes the complete solution of the plane and spherical triangles. The course in analytical geometry includes the discussion of the general equation of the second degree in the plane and the particular forms of the equation of the second degree in space.