inductive lesson, it evidently applies this conclusion to some degree in the study of the further examples, or thinks deductively, even during the inductive process. =Development of Reasoning Power.=--Since reasoning is essentially a purposive form of thinking, it is evident that any reasoning process will depend largely upon the presence of some problem which shall stimulate the mind to seek out relations necessary to its solution. Power to reason, therefore, is conditioned by the ability to attend voluntarily to the problem and discover the necessary relations. It is further evident that the accuracy of any reasoning process must be dependent upon the accuracy of the judgments upon which the conclusions are based. But these judgments in turn depend for their accuracy upon the accuracy of the concepts involved. Correct reasoning, therefore, must depend largely upon the accuracy of our concepts, or, in other words, upon the old knowledge at our command. On the other hand, however, it has been seen that both deductive and inductive reasoning follow to some degree a systematic form. For this reason it may be assumed that the practice of these forms should have some effect in giving control of the processes. The child, for instance, who habituates himself to such thought processes as AB equals BC, and AC equals BC, therefore AB equals AC, no doubt becomes able thereby to grasp such relations more easily. Granting so much, however, it is still evident that close attention to, and accurate knowledge of, the various terms involved in the reasoning process is the sure foundation of correct reasoning. CHAPTER XXIX FEELING =Sensuous and Ideal Feeling.=--We have noted (Chapter XXIV), that in addition to the general feeling tone accompanying an act of attention, and already described as a feeling of interest, there are two important classes of feeling known respectively as sensuous and ideal feeling. When a person says: "I feel tired" or "I feel hungry," he is referring to the feeling side of certain organic sensations. When he says: "The air feels cold" or "The paper feels smooth," he is referring to the feeling side of temperature and touch sensations. These are, therefore, examples of sensuous feeling. On the other hand, to say "I feel angry" or "I feel afraid," is to refer to a feeling state which accompanies perhaps the perception of some object, the recollection or anticipation of some act, or the inference that something is sure to happen, etc. These latter states are therefore known as ideal feelings.