Abstract
The statistical nature of five distributions has been examined: 1. (i) SiO 2 in granitic rocks of Japan. 2. (ii) K in K-feldspar from pre-Cambrian basement granites and gneisses of Southern Norway. 3. (iii) K in K-feldspar from pre-Cambrian pegmatites from Southern Norway. 4. (iv) K in pre-Cambrian granites of South Africa. 5. (v) K in Younger Granites from Northern Nigeria. With the exceptions of (iii) where normality is closely approached, all other distributions are negatively skewed. Closer examination reveals that the negative skewnes of (i), (ii), (iv) and perhaps (v) also, is due to the presence of two (sometimes three) juxtaposed truncated normal distributions, the distribution corresponding to the higher concentration range having the smaller dispersion in each case. The ways of nature are sometimes simpler than we dare to think. But she guards her secrets closely and will reveal them only if our tools are sharp and we know where and how to look.
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