THE study of the history of science, and particularly the detailed history of single sciences, is of very great importance for all scientific workers. The history of botany is as interesting as any. As the content of the subject, like other sciences, increased so vastly during its development, specialisation in modern times became inevitable. Specialisation in itself is not necessarily a bad thing, indeed it is necessary for the progress of science; but by itself it is not enough. Specialisation should be combined with as sound a knowledge as possible of the subject in general.