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apart from volatile agents-is limited to silica. Where the diopside masses have been engulfed as inclusions in the igneous gneiss, the rock is traversed by felspathic veins derived from the fluid magma. The writer wishes to record his indebtedness to Dr. Harker, F.R.S., for encouragement and critical discussion during the progress of these studies. EXPLANATION OF PLATES IX AND XI. PLATE IX. FIG. 1.-Forsterite Marble, Sleaford Bay. The minerals shown are calcite (turbid), dolomite (limpid). Thedoi:10.1017/s0016756800106934 fatcat:gggtmrsf7raulmicz4xbfvbk6e