In 1895 Dr. George Dock of Ann Arbor, summarized 52 reports from his colleagues on the prevalence of goiter in Michigan.1He stated: Goitre occurs in all parts of Michigan. It is most prevalent in the northern part (both peninsulas), but the southern part or the lower peninsula, especially the lower two tiers of counties from lake to lake, show a large proportion.... Immigrants of all nationalities, and many of these are represented in Michigan, are frequently affected.... Among the older writers there is a want of harmony concerning goitre in Indians.... Most of the reporters living near Indians could say nothing about them. However, Dr. W. B. Armstrong reports goitre as common among the Indians near Charlevoix.... In Michigan, as elsewhere, goitre develops most frequently about puberty; next in early middle life. No age is exempt. No case has come under my observation in which goitre was congenital,