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This present investigation was concerned with the content of ash, Mg, Ca, K and N’a of bone, cartilage, incisor teeth and molar teeth in rats of different weights. The results obtained were summarized as follows. 1. Cartilage is the most adequate model for the study in vivo of mechanisms concerned with normal calcification. 2. The percentage of inorganic material in cartilage rose from approx 13% of the dry weight in 5g rat to 46% in the tissue from rats weighing 134g 3. There was no marked change in the content of ash, Ca, Mg, K and Na after eruptions due to the increasing weight.
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