SUMMARY.--APPLICATION OF THE PHASE RULE TO THE STUDY OF SYSTEMS OF
TWO COMPONENTS 207
Summary of the different systems of two components, 208.
(1) _Organic compounds_, 212. (2) _Optically active substances_,
213. Examples, 216. Transformations, 217. (3) _Alloys_, 220.
Iron--carbon alloys, 223. Determination of the composition of
compounds without analysis, 228. Formation of minerals, 232.