Fish is, indeed, their chief food, except roots and casual supplies of antelope, which latter, to those who have only bows and arrows, must be very scanty.
This diet may be the direct or the remote cause of the chief disorder which prevails among them, as well as among the Flatheads on the Kooskooskee and Lewis' rivers.

With all these Indians a bad soreness of the eyes is a very common disorder, which is suffered to ripen by neglect, till many are deprived of one of their eyes, and some have totally lost the use of both.

This dreadful calamity may reasonably, we think, be imputed to the constant reflection of the sun on the waters, where they are constantly fishing in the spring, summer, and fall, and during the rest of the year on the snows of a country which affords no object to relieve the sight.
"Among the Sokulks, indeed among all the tribes whose chief subsistence is fish, we have observed that bad teeth are very general; some have the teeth, particularly those of the upper jaw, worn down to the gums, and many of both sexes, even of middle age, have lost them almost entirely.
This decay of the teeth is a circumstance very unusual among Indians, either of the mountains or the plains, and seems peculiar to the inhabitants of the Columbia.

We cannot avoid regarding as one principal cause of it the manner in which they eat their food.

The roots are swallowed as they are dug from the ground, frequently covered with a gritty sand; so little idea have they that this is offensive that all the roots they offer us for sale are in the same condition." The explorers were now at the entrance of the mighty Columbia,--"The Great River" of which they had heard so much from the Indians.