IX. DIDACTIC CHEMISTRY.

The lectures of Davy and Faraday in England, of Wöhler and Liebig in Germany, of Chevreul and Dumas in France, and of Silliman (1779–1864) in this country, made the study of chemistry attractive and easy during the early part of the century.

It was noticed, however, that the students who finished these courses, while well versed in the principles of the science, were not able to apply them in practice. Towards the middle of the century, therefore, a radical change in the system of instruction was inaugurated. The student was put to work and taught to question nature for himself. The universities of France and Germany were equipped with working desks where students of chemistry put into practice at once the principles of the science which they heard elucidated in the lecture room. Cooke, at Harvard, was the chief apostle of the laboratory method in this country, and this method of instruction has now spread, until even the high and grammar schools have their chemical laboratories.

In our universities, students may now begin their chemical studies associated with laboratory practice in the first year of their course, and continue it to the end. Graduates of such courses are not only grounded in the theories of chemistry, but are thoroughly familiar with its practice. Under this system, coupled with the demand for chemical services in every branch of industry, the number of trained chemists has speedily increased. At this time (1899) there are more than four thousand trained chemists in the United States.