The present series of notes is mainly based upon analyses executed during the years 1867-1877. but these have been supplemented in a few instances by recent work. The series may be regarded as a continuation of several papers published from time to time in the Journal of the Chemical Society, in the Chemical News, and in the Proceedings of the Royal Irish Academy. Throughout these inquiries particular attention has been paid to the degree of tenacity with which the water present in the hydrous species is held.

An orange-coloured ochreous substance from Parys Mount, Anglesey, was recently submitted to analysis.

The observed loss of water at 100°C corresponds to 4H2O, which requires 13.24 percent.

Having heard that a vein of what was supposed to be mispickel had been found about 6 miles north of Newton Stewart, in company with Professor Heddle I visited the place a week or two since. We found the vein had been opened in two places and some of the mineral had been taken out. It proved to be mispickel. The vein runs pretty nearly north and south: it occurs at tho junction of the granite and silurian rocks, commencing about half-a-mile south of the Murray monument, crossing the Palnure Burn, running nearly due south for more than a mile, and then heading to the eastward, where, at about three-quarters of a mile further on, another opening has been made in which is found ehalcopyrite associated with mispickel. The vein, where it has been opened close to the Palnure Burn, is about 7 inches wide, and contains only mispickel.

Augelite was one of several aluminium phosphates from the iron mine of Westanå, Skåne, Sweden, described by C. W. Blomstrancl in 1868 (Öfv. Ak. Förh. Stockh. XXV. 1868, p. 199). He states it to be a massive mineral with distinct cleavages in three directions, and names it augelite (avγη lustre) on account of the strong pearly lustre on the cleavage ṡurfaces. He determines its specific gravity as 2.77, and, as the result of his analyses, represents its chemical composition by the formula, 2Al2O3. P2O5. 3H2O. Since this paper of Blomstrand, as far as we are aware, no further reference to augelite has been made, and, since hitherto distinct crystals of the mineral have not bhen found, its position as a definite species seems to have been regarded as somewhat doubtful, for we find that Dana, in the last edition of the System of Mineralogy, includes it in a rather unsatisfactory group of more or less doubtful species appended to evansite.

The structure called cone-in-cone attracted my attention when I was working at certain forms of jointing and spherulitic structures in rocks, and has been studied in a desultoiy fashion ever since. Moreover, the Museum of University College possesses some good specimens of cone in-cone obtained by the late Prof. Morris, and I received a present of others, which had been used by Mr. W. S. Gresley for his suggestive paper when he left England for America. But though I formed some general conclusions on the subject, I abstained from writing, because I felt doubt concerning one point of importance, and had never seen a good example of cone-in-cone in the field.

Delessite is of much rarer occurrence in Scotland than saponite, and moreover it is by no means so characteristic in its appearances. Its modes of occurrence are much the same, only it is much less frequently the tenant of drases, affecting rather rents or fissures, and in these last it frequently goes to form what may be called a " composite vein." This may be filled for the most pȧrt with fibrous calcite, transversely disposed, and the reopening of the fissure is disclosed by the delessite, which, after lining one side of the vein for some distance, suddenly crosses the fibres of the calcite diagonally, and lies between i~ and the rock upon the opposite side.