Nodules of metamorphosed serpentine which were described by MacDonald have been reexamined. New observations have shown that several minerals not recognized by MacDonald exist in these nodules. Their presence largely explains some of the inconsistencies of his description.

Careful examination of the succession of metamorphic zones about several nodules shows that the changes varied greatly from nodule to nodule, and even in different parts of the same nodule. It is impossible to summarize these changes in a single scheme or graph.

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