. The science and practice of dental surgery. f prognathism or ortho-gnathism vary character-istically in different races(see 101-112). In thoseof the more pure descent formany generations, such asthe Negro or Chinese, thevariations in individuals ofthe same race is leastmarked, but in mixed races,like the English and Ameri-can, diversity of tyY>e pre-vails. It should be remem-bered that only about thirtj^or forty generations separatethe Englishman of to-dayfrom the several races fromwhose fusion he derives hisinheritance, and it wouldl)e surprising if uniformityof type had become ev
. The science and practice of dental surgery. f prognathism or ortho-gnathism vary character-istically in different races(see 101-112). In thoseof the more pure descent formany generations, such asthe Negro or Chinese, thevariations in individuals ofthe same race is leastmarked, but in mixed races,like the English and Ameri-can, diversity of tyY>e pre-vails. It should be remem-bered that only about thirtj^or forty generations separatethe Englishman of to-dayfrom the several races fromwhose fusion he derives hisinheritance, and it wouldl)e surprising if uniformityof type had become evolvedill so short a time. It is,then, necessary to recognizethe fact of somewhat widediversity of form and featurein the skull and face, and theshape of the arch withinlimits that may fairly becalled normal is not the least 65 variable factor. Excellent profile photographsshowing normal and abnormal variations andtypes are given in Lischers monograph (105). (e) The character of the face bears a dis-tinct relation to the character of Fig. 107.—Bushman. The arelies are small compared with others sliown, but the Bushmen are asmall race. (Half natural size.) (Museum of the Royal College of Surgeons of England.) The operator who venturesso to mould his jDatients jawsand features as to conform tohis own or a theoretical idealis exceeding the limitationsof his profession and courtingfailure. This is not to say thatvast improvements in ap-pearance may not be gainedby judicious treatment ofthe teeth and alveolus. Sotrue is this that caution isthe more necessary, in orderto avoid providing a patientwith a dento-facial areaout of harmony ^^•itll the typeof which he or she happens tobe an example. The principles of art thatshould guide the orthodontisthave been clearly enunciatedby Henry Read (136) in ashort but illuminating conclusions are— (ft) There is no absolutestandard of humanbeauty. (b) A relative standard canbe found in the aver- age or composite. (c) S
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
