In clear running water

Frank Owen Payne, How to teach about Aquatic Life, New York & Chicago, E.L. Kellog, 1901, p. 57-58.

Stone-flies- These most interesting creatures are usually found in clear running water. They are so called because they live in cases made od tiny stones or sticks. These cases are often built with consummate masonry, the pebbles being selected with greatest care and cemented together with a secretion from the tiny creature. These cases are usually about ½ to 1 in. long and 1/8 to 3/16 in. in diameter, open at one end, from which the legs, head, and antennae may be seen projecting.

At first sight nothing is more interesting than to  see these dainty stone cylinders moving about over the bottom of a stream.