These two courses form a continuous treatment, the subject matter of which is selected with a more especial view to the needs of students entering the chemical industries than is usual in this subject. The abstract principles of chemistry are developed in such a way as to emphasize their practical importance, and to lead the student to facility and confidence in the application of theoretical knowledge to his everyday work. A large part of the work consists to the solution of problems by the students. The problems are discussed in detail, the aim being to develop the power to use principles, rather than merely to impart factual knowledge of the phenomena. The topics considered in the course are the pressure-volume relations of gases, the properties of solutions related to molal composition, the conduction of electricity in solutions, the ionic theory, the mass-action law applied to the rate and equilibrium of chemical changes, heterogeneous equilibrium from the phase-rule standpoint, thermo-chemistry and thermo-dynamic chemistry. Under the latter topic are considered the free-energy change attending chemical reactions, the maximum work obtainable from them, the effect of temperature on free-energy and a number of applied topics in electro-chemistry such as electro-motive force of voltaic cells, electrode potentials in relation to the equilibrium of oxidation and reduction reactions, electrolysis in relation to electromotive force and concentration, and gas polarization. Throughout the two courses, the scientific background of the chemical industries is constantly impressed upon the student. Only by constantly applying the principles to concrete problems will the student acquire such a knowledge and the power to use it in new cases. _Text: Getman and Daniels, “Outline of Theoretical Chemistry” (for CH 31 and CH 41)._ CH 32 Quantitative Analysis. This course includes both the theory and the practice of quantitative analysis. In the laboratory, training is given in the correct technique of quantitative work, first in volumetric and then in gravimetric determinations. Later, extended analyses are carried out. In the classroom the principles underlying the laboratory work are studied; additional methods also are considered. Throughout the year the student receives training in the calculations of analytical chemistry, with special attention to the errors of measurement. Particular consideration is given to the accuracy of the methods studied, in connection with the requirements of their use, and to the saving of time by proper planning of work and choice of method. _Texts: Kolthoff and Sandell, “Textbook of Quantitative Inorganic Analysis”; Giesy, “Problems in Quantitative Analysis”._ CH 33 Thermodynamics. This follows the lines of course ME 31 Thermodynamics but is adapted to the needs of industrial chemists.