<h3>To the Editor:—</h3> The case report of Drs. Wilbur and Eusterman on the subject of night blindness (The Journal, February 3, p. 364) is of more than ordinary interest. I entered the navy when all the sailing ships had not yet disappeared from active commission; in fact, my first cruise was on such a ship, and there I listened in the ward room to remarkable stories of night blindness and moon blindness alleged to have appeared among the crews of merchant ships. At the time I swallowed these stories with a grain of salt, but later as I became more familiar with the writings of the ancients I was struck with the more or less common occurrence of descriptions of this disease among the earliest Greek, Arabic and Latin writers. Hippocrates describes the disease in the second book of Prorrhetics. He says: It is most apt to attack the young