For merely _practical purposes_, all that is necessary to know about the digestive process is that by a peculiar arrangement of the muscle forces of the stomach the food is made to revolve in such a way as to wipe the exuding digestive juice from the walls; that, therefore, the finer the division of the solids by mastication the more rapid the solution to the absorbing condition. That meat in finer particles will sooner dissolve than meat in large, solid masses is clearly seen. It will be recalled that digestive conditions are really soul conditions, as if there were actual wires extending from the very depths of the soul itself to each individual gland, with power to ebb and flow as the mental condition shall determine. It may be presumed that _power_ to digest is the power to revolve food in the stomach and the power to generate the gastric juice as determined by the power of the brain, the glands themselves not holding their juice in mere reserve, but power to generate in reserve. Thus it is seen that food in excess is in every way exhaustive as the immediate result. These may be called the subjective conditions of digestion. Now let us consider some of the objective conditions from the standpoint of moral science. What the sunshine of a warm day is to all growing things on the earth, so is that shining seen in other faces that reaches the depths of the human soul with brightness and life. _Overeating_ is so universal from the general ignorance of practical physiology that few stomachs have a time for a full clearing with the needed rest before the time of another filling arrives. It is therefore a matter of sheer necessity not only to attain and maintain the utmost possible cheer of soul, but it is also a necessity to have cheer in other souls with whom relations are intimate. As a matter of extraneous _digestive aid_, a cheerful soul in a family is an abiding source of digestive energy to all in social contact. It affects the digestive energy of all, as the breeze the fire, as the clearing sky the low spirits from the gloom of chill and fogs. The eyes that do not glisten with higher life, the lines upon the face that are not alive with cheerful, kindly emotions, the frowning look, the word that cuts deeply, have their repressive effects upon digestive energy within their remorseless reach. The _moral science_ of digestive energy is a new study; it is not known as a factor in the process of digestion; but the time is coming when cheer of soul will become a study as of one of the finer arts, and then human homes will not be so much like lesser lunatic asylums without the restraining hands of a wise superintendent.