The six principles enumerated on the preceding page not only aid memory but cultivate and strengthen every power of the human mind. The system leaves no faculty unemployed, but brings all into the service of memory, directly or indirectly. The development of memory is only one of many advantages resulting from its principles, for their daily practice will develop in the mind powers of a high order, and gifts of the greatest value in every career. The system is not only com prehensive but complete. The six principles embodied in it meet every need and fit every variety of mind and all are absolutely essential, though all need not be used at the same time. Though there are only two great laws of memory Similarity and Contiguity — yet these manifest themselves in such endless variety of form that other minor laws have been derived from them designed to meet certain needs and certain cases. To cultivate the memory all round, to aid it in all its operations to make it quick to acquire, strong to retain and ready to reproduce; to do this, requires many and Special adaptations of the two great laws before referred to, and also a wise and judicious application of them.