The Postnatal Development of the Molar Teeth in the Cotton Rat

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Abstract
The rates of postnatal development and eruption for the molar teeth of cotton rats (Sigmondon h. hispidus) maintained on a stock ration composed of natural foodstuffs were detd. A survey was also made on the effect of purified rations fed after weaning on the time of eruption of the maxillary and mandibular 3d molars. The time of emergence into the oral cavity and the completion of eruption of the 3d molars were much later for cotton rats fed the purified rations than in those maintained after weaning on rations composed of natural foodstuffs.
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