Book; and its intelligent use in this stage of education has made little or no headway against their venerable traditions. That things are only understood by being turned over in the mind and looked at from various points of view is, of course, altogether too modern a conception for our educationists. At the London Royal College of Science, for example, which is an exceptionally new and efficient College, there is no properly organized escape from the orthodoxy of the lecture-theatre, no circulating library whatever available to the students, no library, that is, which will ensure a copious supply and exchange of the best books on each subject, and, consequently, even to look up an original paper that has been quoted or discussed, involves an expenditure of time that is practically prohibitive of the thing as a general practice. [Footnote: There are three very fine libraries in the adjacent South Kensington Museum, especially available to students, but, like almost all existing libraries, they are managed in most respects on lines conceived when a copy of a book was an almost unique thing made specially by the copyist’s hand. However much a book is in demand, however cheap its price of publication may be, no library in England, unless it is a modern subscription library, ever gets duplicate copies. This is the cause of the dearness of serious books; they are bought as rarities, and have to be sold in the same spirit. But when libraries learn to buy by the dozen and the hundred, there is no reason why the sort of book now published at 10s. 6d. should not be sold at a shilling from the beginning.] The Professors, being busy and important men, lecture from their particular standpoints, and having lectured, bolt; there is no provision whatever for the intelligent discussion of knotty points, and the only way to get it is to buttonhole a demonstrator and induce him to neglect his task of supervising prescribed “practical” work in favour of educational talk. Let us, therefore, in view of this state of affairs, deal with the general question how a branch of thought and knowledge may be most beneficially studied under modern conditions, before discussing the more particular question what subjects should or should not be undertaken.