. The Dental cosmos . Right and left upper canines of a dog, showing extra canine on one side andpartially divided canine on the other. (After Bateson.) canine or a fifth premolar or molar in any Another important difficulty in the waymammal. The theory of atavism evi- of accepting this explanation is the fact Fig. Supernumerary premolar on one side and partially divided premolar on the other, in a seal. (After Bateson.) dently fails to offer a general explanation that the supposed atavistic teeth are often covering all these cases, even if we assume not at all atavistic in appearance. The
. The Dental cosmos . Right and left upper canines of a dog, showing extra canine on one side andpartially divided canine on the other. (After Bateson.) canine or a fifth premolar or molar in any Another important difficulty in the waymammal. The theory of atavism evi- of accepting this explanation is the fact Fig. Supernumerary premolar on one side and partially divided premolar on the other, in a seal. (After Bateson.) dently fails to offer a general explanation that the supposed atavistic teeth are often covering all these cases, even if we assume not at all atavistic in appearance. They a reversion to the reptilian stage of evolu- may be the merest vestiges, as in the so- 1196 THE DENTAL COSMOS. called enamel dropsthey may be rudi- teeth of their respective series (incisor,mentary, as in the conical peg teeth; premolar, etc.), and of the species in Fig. 3.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentist, bookyear1912
