FOLLOWINGTHE TREATMENT of the theoretical aspect of learning and transfer of training in the preceding chapter, this chapter will reviewstudies of certain types of learning, such as motor learning and skill, memory and association, the formation of concepts, and problem solving, and will also deal with some of the conditions affecting learning. All studies dealing with the motivation of learning, individual differences, and the relation of general intelligence to learning are reserved for treatment in Chapter III.A number of excellent studies relating to learning in the various school subjects have been omitted from those treated in this chapter due to the fact that special numbers of the Review of Educational Research (92, 125) are devoted to the psychology of school subjects. However, many of the studies of the psychology of school subjects consist in applications of basic studies of learning, such as are reported in this chapter. Some other investigations which deal with the same types of learning reported here are reserved for treatment in Chapter IV, where they are reviewed as illustrations of the way methods of teaching affect learning.