The aim of all training is to establish good habits--ways of doing things which will leave the subject with more capital to invest so to speak, as he wastes less. It follows that the same methods should always be used in trying to attain the same end. There are few subjects of equal importance so little considered by students of music in a conscious intelligent way. A clear conviction as to the foundation for close adherence to certain methods of doing things is an invaluable mental asset for any student. The whole subject of breathing has been so fully considered in previous chapters--indeed more or less in all parts of this work--that it is not necessary to go into much detail now. The investigations of physiologists in the internal have only emphasised the author's teaching on this subject. The present position of the subject may be stated thus: (1) In inspiration the whole chest is enlarged, this involving the descent of the diaphragm. (2) The amount of mobility is much greater in the lower half of the chest. (3) This lower half of the chest and the diaphragm act together, constituting a special mechanism of great importance. (4) The abdominal muscles discharge a cooeperative function. It follows that the advice of a present day famous tenor to "breathe low" is sound. Nevertheless, it must not be forgotten that inspiration begins above and that the upper chest has its functions also. It is not merely a region of support for the lower mechanism, important as this function is. The terms "abdominal" and "diaphragmatic" respiration have led to misunderstanding. Neither the abdominal muscles nor the diaphragm ever act alone in normal respiration, though they are important cooeperative factors. Breathing exercises should be based on broad views of the subject, and no part of the respiratory mechanism should be neglected.