page 42 note * The “felspar” of the rock of Corstorphine hill is usually called albite,—it has not been analysed.

page 43 note * It also constitutes the bulk of the grey granite of Aberdeen ; this I find generally to consist of a great deal of oligoclase, little orthoclase, comparatively little quartz, very small quantities of muscovite, and a good deal of Haughtonite. The hornblendie gneiss of the Cape Wrath district frequently consists almost solely of a granular mixture of oligoclase and hornblende.

page 43 note † Except as regards the discrimination of oligoclase and andesine.

page 60 note * The special convenience of the small beaker for determining the specific gravity of comparatively large crystals is a good reason for its introduetion,—the ordinary sp. gr. bottle is well-known.—Ed.