. Breviora. 968 RODENT INCISOR ENAMEL 7 Thickness measurements were made by comparing the projection of a thin section with a micrometer slide. The number of bands within a standard unit of a micrometer eyepiece divided by the length of the unit in millimeters yields the average band width. Inclination was measured on the rotating stage of a petrographic microscope. In each case 430 diameters magnification was used. Tabulation and statistical analyses of the measurements are given in Tables 1-4. The formulae used in computation are those given by Simpson, Roe, and Lewontin (1960: 84, 90, 166).
. Breviora. 968 RODENT INCISOR ENAMEL 7 Thickness measurements were made by comparing the projection of a thin section with a micrometer slide. The number of bands within a standard unit of a micrometer eyepiece divided by the length of the unit in millimeters yields the average band width. Inclination was measured on the rotating stage of a petrographic microscope. In each case 430 diameters magnification was used. Tabulation and statistical analyses of the measurements are given in Tables 1-4. The formulae used in computation are those given by Simpson, Roe, and Lewontin (1960: 84, 90, 166). Ab- breviations are as follows: N, sample size; OR, observed range; % 3 0. .080 .090 .100 140 .150 .160 % 50 40 30 20 10. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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