THE JOURNAL OF CUTANEOUS DISEASES
VOL. XXIX MARCH, 1911 NO. 3
By GEORGE F. HARDING, MD, Boston.
It is now some years since the custom of going about in the open without a head covering was started, partly from popular belief that it was of benefit to the hair, partly as a result of medical advice. The idea seems to have started from the fact that savage races and peasants, who are continually in the open, have as a rule abundant natural head covering; also from the impression that the bluecoat boys of Christ-Church Hospital in London, who never wear hats, possess hair of more than ordinary thickness.
Exposure to the Sun As an Ætiological Factor in Alopecia.. Arch Dermatol. 2011;147(3):281. doi:10.1001/archdermatol.2011.22