To win success in appearance, you must study the irregularities of the natural projection of circle, and the character of circle. If any irregularities are observed, take a model cast of the mouth, so that you can compare the natural organs whilst the artificial are in progress of arrangement; modify these irregularities, but do not efface their existence altogether. The general conformation of the Dental organs and the face must be your special study. The colour of the teeth to be selected must receive at your hands great care: compare the various tints at your disposal, ascertain if a perfect self colour, or a tinted, shaded, or stained tooth is the most pleasing; which will harmonise best with the complexion, producing a natural effect. It will be your object to disguise that the new introductions are foreign bodies, endeavour to make them appear as if they possessed life. Many colours absorb so much light that at night the appearance they present is black and death-like. Avoid such shades, select those that reflect light; in many cases the teeth should be almost transparent. The colour of the hair, the nature of the complexion will guide you in this endeavour; hair and complexion must harmonise. A heavy, wavy head of hair, dark and massive, with bronzed face would indicate a strong shaded tooth, solid in character and non-transparent, yet a colour that will reflect rather than absorb the rays of light. A Saxon face with fair hair will strongly puzzle you at times; the pearl hued, thin and transparent teeth, as a rule, are appropriate for such a face. When articulating the dentures, every care must be taken and much thought and study bestowed to adjust the depth and height of the superior and inferior dentures to the length and depth, to the thickness or thinness of the lips. Note and estimate the loss of structure by absorption, and supply in proportion to the loss. The circle and projection as above alluded to will be your special study. Give hours to produce a natural expression. Propose to the patient a short walk in your operating room; if a good corridor is at your disposal, so much the better, use it. By so doing you will ascertain what, if any, old habit of contortion of features is indulged in by the patient; the character of the laugh, if the lips are raised, and how much; at times only the tips of the teeth are manifest, at others the full lip is raised exposing to view the crown of the tooth and the alveolus, even to the lower margin of the meatus of the nose. Arrangements equal to all these expressions must be adopted. The how, will be told you in future lectures.