SNOW-CRYSTAL ANALYSIS AS INDIRECT AEROLOGY 
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Fic. 5—Cross sections of temperature and humidity; above: derived 
from aerological soundings; below: derived from snow-crystal analysis, 
Hohenpeissenberg, March 21, 1958 (Operation 27) 
of certain characteristics that did not form ice- 
crystals before coming into this layer. Crystals 
fallmg from a higher layer through the whole 
depth of a second layer may expect an approxi- 
mately equal increase of their rate of fall, and 
their rates of growth are nearly the same. The 
size spectrum of these crystals or their appen- 
dices, respectively, will show only a narrow fre- 
quency culmination. If these crystals were formed 
in the second layer, however, they would show 
quite different sizes. In this case the size spectrum 
will be broad. The frequency curve ought to in- 
dicate the form of a gaussian distribution. In the 
case of a broad spectrum several frequency-cul- 
