Eye color for a plausible argument stating that some eyes can or do change, based on chemical reactions and hormonal changes within the body. Studies on Caucasian twins, both fraternal and identical, have shown that eye color over time can be subject to change, and major demelanization of the iris may also be genetically determined. Most eye-color changes have been observed or reported in the Caucasian population with hazel and amber eyes. Carleton Coon created a chart by the original Martin scale. The numbering is reversed on the scale below in the (later) Martin–Schultz scale, which is (still) used in physical anthropology.
American Journal of Physical Anthropology physical anthropology. Scientists hoping to learn more about recent discoveries often had to wait for several months or even years before becoming available in libraries throughout the country. In addition to its monthly issues, the association also publishes two supplements, the "Yearbook of Physical Anthropology" and a meeting supplement. In the 19th and early 20th centuries, anthropology was embedded in a larger milieu of scientific racism and eugenics. Hrdlička put prominent eugenicist Charles Davenport on the journal's editorial board, and used his connection to Madison Grant to obtain funding for his new journal. Hrdlička was deeply suspicious of genetics and