It is impossible to insist too strongly upon the fact that efficient
teachers of science and of technology are not to be made by the
processes in vogue at ordinary training colleges. The memory loaded with
mere bookwork is not the thing wanted--is, in fact, rather worse
than useless--in the teacher of scientific subjects. It is absolutely
essential that his mind should be full of knowledge and not of mere
learning, and that what he knows should have been learned in the
laboratory rather than in the library.