^{page 197 note *} I cannot too highly recommend this simple and cheap little furnace; it commands every temperature, and, for mineral analysis, is superior to all others which require a blowing apparatus.

^{page 203 note *} I except, of course the case where titanic acid is present.

^{page 217 note *} Or Saponite or Strigovite;—not yet analysed.

^{page 229 note *} Were it not so, we would have to regard these as being all microlines; but DESCLOISEAUX (Comptes rendus, April 17, 1876,) holds these to consist of a mixture of orthoclase, microlin, and albite. In perthite,—where there is a somewhat parallel banding of orthoclase and albite,—the two were probably paragenetic in time; but the microscopic structure of perthite—the only mineral in which there has been a chemical determination of the nature of the layers—is so different from this, as to form the very strongest arugment against the view that the intruded material is here albite.

^{page 233 note *} Supposing the crustal to be positioned as usual with the faces m vertical.

^{page 234 note *} This consisted of a single crystal of nearly an inch in size, imbedded in granite—or part of a granitic vein,—it was found and given to me by the late T. Bell of Ballgrogan. The precise locality has escaped my memory. It has a pale but fine green colour.

^{page 240 note *} Fe₂O, also 08 Mn.

^{page 251 note *} Somewhere near this spot, Mr Grieve of Burntisland found a loose piece of hypersthene, showing a cleavage face over an inch in extent.

^{page 256 note *} The late Rev. Mr organ of Stonehaven had so great an admission for these specimens, that he was wont to spend months in wandering over the Kildrummy and Clova Hills in search of them; and so thoroughly had he scoured the district, that the present writer, who has made repeated journeyings with the same object, was never successful in finding either the original locality, or a single specimen.

^{page 264 note *} 8 Fevrier 1875.

^{page 265 note *} The “felspar” of the rock of Corstorphine Hill is usually called albite,—it has not been analysed.

^{page 265 note †} It also constitutes the bulk of the grey granite of Aberdeen; this I find to consist of a great deal of oilgoclase, little orthoclase, little quartz, very small quantities of muscovite, and a good deal of Haughtonite, such a compound as G.Rose calls granitite. The hornblendic gneiss of the Cape Wrath district frequently consists almost solely of a granular mixture of oilgoclase and hornblende.

^{page 266 note *} Except as regards the discrimination of oilgoclase and andesine.