Thyroid enlargements in this tropical portion of the world are met with more frequently in the white race than among the blacks.
During the past three and a half years, at the Board of Health Laboratories, Ancon, twenty-one specimens of thyroid glands showing large colloid cysts associated with hemorrhages and fetal adenomata have been received from the surgical clinic of Ancon Hospital, and four similar cases have been found at necropsy during the same interval of time. Sixteen of them occurred in females and nine in males. Thirteen of these cases were in Americans, all but one being females. Seven were in male Spaniards. One instance in a male Panamanian and one in a male Greek. Only three of the twenty-six cases occurred in negroes: two female Jamaicans and one female Barbadian. The ages range from 19 to 61 years, the average being about 38 years. A fair idea of