Abstract
1) Precise methods for investigating sensory spots on the oral mucous membrane were described, and the results of investigations on the four modalities of sense were illustrated.
2) The senses in the order of density of their receptors are: pain, touch, cold and warm.
3) The receptors for all senses are present most densely on the anterior parts of the membrane.
4) The gingival margin and interdental papillae possess less pain spots and more touch spots.
