Table 47——-Sr** IN HUMAN TEETH Cain ash, % Sr"/y Ca, puc Specimens Analyzed at HASL (Calcified 3-5 years ago, collected by Dr. L. Makta, New York) 29.5 22.3 27.4 Reference No. 0.79 + 0.12 0.34 + 0.10 0.48 + 0.10 Description Ca in ash, % Sr’"/g Ca, pyc Specimens Analyzed at the University of Chicago (Collected during the summer of 1954 and furnished by Dr. S. Warren, Boston, Mass.) Group I Group I Group III Group IV Primary dentition both sound and carious Both sound and carious teeth from children under 15 years Carious teeth from children under 15 years Both sound and carious teeth from persons Group V over 15 years Carious teeth from persons over 15 years 37.8 38.0 0.038 + 0.010 =0.12 36.8 36.9 0.046 30.046 36.8 =0.006 Specimens from England (Furnished by Dr. S. Warren, Boston, Mass.) CL-159 Adult ages 18 to 35 years, London, Apr. and May 1950 35.6 0.014 + 6,010 CL-400 CL-594 CL-665-P Deciduous, Bristol, Oct. 1954 to Jan. 1955 Deciduous, Bristol, Jan. to Apr. 1955 Permanent teeth from persons over 15 years, 37.9 38.0 38.7 =0.10 50.012 0.026 + 0.011 Bristol, Jan. to Apr. 1955 100