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Fie. 9—Dimensions of single crystal forms; frequency of their occurrence 
expressed as percentage; Hohenpeissenberg, March 1958 
be narrow as well as broad, the probability curve 
more pointed or flatter, and the most frequent 
diameters smaller or larger. With that, also the 
frequency curve depends upon the momentary 
structure and the characteristic of the layers and 
thus presents another means for the indirect aero- 
logical analysis. 
Dimensions of crystals—Supplementary, the 
dimensions of all measured crystals of the same 
type were compiled as frequency curves, showing 
the dimensions of single crystal forms expressed 
as percentage (Fig. 8 and 9). These curves were 
not smoothed. Their form of a probability curve 
expresses that under given climatic conditions 
and altitude, dimensions can be expected that 
have characteristic sizes for the different types of 
crystals. Other material based on exact measure- 
ment of a sufficiently large number of individuals 
of erystals is only known for Sapporo, Japan, 
near the sea-level and, for only few forms, for 
Mt. Tokachi, 1060 m above sea level. The typical 
values found on Mt. Hohenpeissenberg, 1000 m 
above sea-level, mostly show smaller dimensions 
than the ones ascertained in Sapporo. The differ- 
ences are relatively small with those forms grow- 
ing in upper layers at a temperature of about 
below —20° C. But they are great for the forms 
