whereby

the ingested food is converted into material suitable for a imilation with consequent upbuilding of the ti ues or the liberation of energy, gas'tric d., that part of digestion, chiefly of the proteins, which is carried on in the stomach by the enzymes of the gastric juice, intercell'ular d., d. in a cavity by means of secretions from the surrounding cells, such as occurs in the metazoa. intes'tinal d., that part of d. which is food-stuffs—starches, carried on in the intestine, it affects all the fats, and proteins, intracellular d., d. within the substance of a cell, such as occurs in the protozoa and in phagocytes, pep'tic d., gastric d. pri'mary d., d. in the alimentary tract, sal'ivaiy d., the conversion of starch into sugar by the action of the salivary ferments, sec'ondaiy d., the change in the chyle effected by the action of the cells of the body, whereby the final products of d. are a imilated in the proce of metabolism.