was a male, aged nineteen. 'file maxilla showed transposition T ofH Ethepatient right maxillary first premolar into the position of the right maxillary lateral incisor. The lateral incisors were absent as revealed by x-ray photographs. The articulation was far from normal, the anterior teeth being
practically edge to edge in occlusion. Grinding in t he bite of the posterior teeth, and, at the same time, forcing the maxillary incisors slightly forwards by mechanical means was considered to be the only possible line of treatment to adopt, if indeed it were wise to interfere at all. "Transactions ot the British Society tor the Study ot Orthodontics.