A system of dental surgery / by Sir John Tomes.

  • John Tomes
Date:
1887
Catalogue details

Licence: Public Domain Mark

Credit: A system of dental surgery / by Sir John Tomes. Source: Wellcome Collection.

    119/808 page 103
    Xuincroiis other oxainples iiiiu'ht l)e collected, ljut tlie forcgoiu!;- will siitticieiitly serve to illustrate tiiiit strong tendeiKty to iiereditary transmission of peculiarities wiiicii is found to exist, and to suffice to cause dental irregularities. Correlations of growth are found to exist between })arts of the organism, wiiicii, so far as we know at ])resent, have little or nothing to do with one anotiier ; but in other examjiles of this concomitant variation some homological relation can lie traced between the varying organs. Such is the case witii iiair and teeth, which in tlieir origin are closely similar, and wiiich only become strongly ditt'erentiated in their after develo|inient. And it has been remarl;ed liy Mr. Darwin that tliose orders of Manunalia wliicii are most aberrant in their dermal cover- ings, namely, the ('otacea and Edentata, are also remark- able for deficiency or redundancy in the number of their teeth. For example, the hairless, naked Turkish dog is extremely deficient in its teeth, often iiaving none except one molar on each side, and perhajjs one or two imperfect incisors (') ; and tiio same fact lias i)een observed in a iiaii'lcss terrici'. Inherited l)aldness lias been found associated with inherited deficiency of the teeth, and it is stated by Mr. Sedgwick (-) tiiat in rare cases where the hair has l)cen renewed in old age this lias usually been accom[)auied l)y a iviiewal of the teeth. Mr. Craufunl, as ([uotcd l>y Mr. Darwin, states that at the Bin-mese ('ourt tliere was a man covered witli straight silky liair, which on the spine and slioulders was as nuicli as five inches in length. He iiad no molar teetli, and the incisors were very small ; Ids daugliter inherited tlie jiecu- liarity of n. iuury skin, iier face, even including tlie nose, l)eing covered witii silky hair, and, like iier fathci-, slie iiad neitlier molar noi' i)icusi>id teeth. (') Darwin, Animals .■mil Plants under DomcsticatiDn, vol. i., p. 31. (-) llritisli ami Fureign Moiliro-Cliinirg. Review, April, lSt;;j.
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