Incidentally it may be of value to consider what this condition of minimum intra-thoracic capacity really means and to note some of the influences upon the whole organism. For as this thoracic cavity contains many of the vital organs, the whole abdominal viscera is directly or indirectly influenced by its capacity. Minimum thoracic capacity means that the organs within the thorax are harmfully compressed and that the heart and lungs do not get a proper chance to function adequately. A harmful strain is thrown upon the heart, the lungs are not adequately employed or sufficiently aerated, and the lung tissue deteriorates. The proper distribution of the blood is interfered with because of the undue accumulation in the splanchnic area, to the detriment of the lung supply. As the lungs are the chief distributors of blood it will be understood that this condition of minimum thoracic capacity interferes with the circulation and general nutrition. The respiratory processes are employed in sucking in air instead of creating a partial vacuum in the lungs by a co-ordinated thoracic expansion which will give atmospheric pressure its opportunity.[5] There is an undue intra-abdominal pressure and harmful flaccidity of the abdominal muscles, which means dropping of the viscera, imperfect functioning of the liver, kidneys, bladder, etc., stagnation in the bowels and irritation and distention of the colon, intestines, etc.; in other words, indigestion, constipation and all the concomitant disorders and general impairment of the vital functioning. Let us, for a moment, think of the thoracic and abdominal cavities as one fairly stiff oblong rubber bag filled with different parts of a working machine which are interrelated and interdependent, and which are held in position by their attachment to the different parts of the inner surface of this bag. We will then suppose, for the sake of our illustration, that the circumference of the inner upper half of this bag is three inches more than that of the lower half. As long as this general capacity of the bag is maintained the working standard of efficiency of the machinery is indicated as the maximum. Let us then, in our mind’s eye, decrease the capacity of the upper part of the bag and increase that of the lower half until the inner circumference of the latter is three inches more than the former. We can at once picture the effect upon the whole of the vital organs therein contained, their general disorganisation, the harmful irritation caused by undue compression, the interference with the natural movement of the blood, of the lymph and of the fluids contained in the organs of digestion and elimination. In fact we find a condition of stagnation, fermentation, etc., causing the manufacture of poisons which more or less clog the mental and physical organism, and which constitutes a process of slow poisoning.