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- 116 - I I I I I I I I I I I I I I I I I I I the ambient temperature. In contrast to the findings of Magono and Lee, our aircraft and ground observations showed that there were combinations of solid bullet-like crystals as well as combinations of hollow bullets. Ground measurements indicated that hollow bullets occurred much more commonly than solid bullets. Combinations of hollow bullets were the most common crystal ,type of the three. In addition, many single bullets had aggregated by the time they reached the surface. The shapes of the bullets were highly variable. Most of them had fairly flat bases and their sides tapered to a narrow pointed tip. However, the shape of the tip, its width in comparison to its base, and the manner in which the body of the crystal tapered toward the tip, were very variable. There were also some unique bullet-like crystals which have not previously been reported in the literature. These exhibited some of the characteristice of normal bullets, such as forming combinations, but the growth patterns were very unusual. Observations from the air indicated that bullets ranged in size from 150 to about 750 ~m in length. Measurements were not made of the other dimensions of the bullets (which appear to be highly variable) or of the dimensions of hollow bullets compared to solid bullets. Further work needs to be done to determine under what atmospheric conditions slender bullets and stubby bullets grow. Bullets as long as nearly 1500 ~m were observed at the ground. However, the average size was about 500 ~m. Again, cold region crystals remained shorter in length than crystals growing at temperatures above -200C. Bullets were not generally observed to fragment, although it was occasionally noticed that part of the tips were missing.