Abstract
IN NATURE for June 17 Dr. van Bemmelen directs attention to the excess rate of rising which pilot-balloons often show in the first few minutes of their ascent, and refers to two explanations of this phenomenon which have been put forward. These are that the rapid rising may be due (1) to turbulence in the lower layers of air or (2) to the tendency of balloons to be drawn into rising columns of air and thus to partake of their upward motion. The curves reproduced by Dr. van Bemmelen, which indicate the relation between rising velocity and height under different conditions, are of great interest, and show that the effect is not found when working on a small island in the Java Sea.
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