The effect of a violent hailstorm on Camnula pellucida Sc. was noted at 2:15 P. M. on July 6, 1930, at a time when enough instruments were on hand to make a few records. The area was an observation station on the open range in Chilcotin, British Columbia, at an elevation of 3,400 feet; range cover was slight, consisting of a closely cropped, overgrazed turf of Poa running to an alkaline patch of Distichlis.