a couple of thousand feet, it appeared to bend around almost double and to stretch about southeast for a somewhat greater distance. This second cloud again seemed broken off rather sharply and a large cloud gradually spread with less and less well defined shape from the upper end of the second step. This process was nearly complete when the upper cap was spread over most of the bowl at a height of about 30,000 feet. There was a strong impression of definite layers in the wind structure, and there were even some water vapor clouds which seemed to mark the boundaries between winds of different directions. The completion of this stage took many minutes until finally the cloud was rather well dispersed toward north 10,000 at a rather low level, had overspread at an intermediate level all the way to the Oscuro mountains, and on a higher level was drifting slowly south and southeast.
