1V Contents. 
XIV.—Method of Determining the Absolute Dilatation of Mercury. By J. 
Jouy, Sc.D., F.R.S., Professor of Geology and Mineralogy in the 
University of Dublin ; Hon. Secretary, Royal Dublin Society, 
XV.— On Series in Spectra. By Arrour W. Conway, M.A., F.R.U.L., 
Professor of Mathematical Physics, University College, Dublin, . 
XVI.—Index of the Principal Lines of the Spark-Spectra of the Elements. 
By James H. Potuox, D.Sc. (Plates X. and XI.), c 
XVII.—On the Quantitative Spectra of Iron, Aluminium, Chromium, Silicon, 
Zinc, Manganese, Nickel, and Cobalt. By James H. Poxtox, 
D.Sc., and A. G. G. Leonarp, A.R.C.Sc.I. (Plates XII.-XVII.), 
XVIII.—On the Quantitative Spectra of Barium, Strontium, Calcium, Mag- 
nesium, Potassium, and Sodium. By James H. Potton, D-Sc., 
and A.G. G. Leonarp, A.R.C.Sce.1. (Plates XVIII. and XIX.), 
XIX.—On some Devices facilitating the Study of Spectra. By WatrTer 
Nort Haxttey, D.Sc., F. R. S., Royal pause? of ee Dublin. 
(Plate XX.), 
XX.—Note on the Spectra of Calcium-and Magnesium as observed under 
different Conditions. By Watrrr Nost Harrusy, D.Sc., F.R.S., 
Royal College of Science, Dublin, A 
XXI.—The Synthesis of Glycosides: some Derivatives of Xylose. By 
Hueu Ryan, M.A., D.Sc., F.R.U.1., and Grorer tee B.A., 
Catholic University School of Medicine, Dublin, 
XXII.—The Radioactivity of Sea-Water. By J. Jony, Sc.D., F.R.S., 
Professor of Geology and Mineralogy in the Conyers? of Dublin, 
Hon. Sec., Royal Dublin Society, 
XXIII.—On the Separation and Quantitative Spectra of Cerium, Lanthanum, 
and Yttrium. By James H. Poxttox, DSc., and A. G. G. 
Leonard, A.R.C.Sc.1., Royal College of Science, Dublin. 
(Plates XXI.-XXIII.), ‘ : : : : : : 
XXIV.—On the Quantitative Spectra of Molybdenum, Tungsten, Thorium, 
and Zirconium. By A. G. G. Lronarp, A.R.C.Sc.1., Bee: 
College of Science, Dublin. (Plate XXIV. ; : 
XXV.—On a simple Form of Apparatus for observing the rate of Absorption 
of Oxygen by polluted Waters, and by other fermenting Liquids. 
By W. E. Avewney, D.Sc., F.I.C., Curator and Examiner in 
Chemistry in the Royal University, Dublin, : 6 
XXVI.—On the Radium-Oontent of Deep-sea Sediments. By J. Jory, Sc.D., 
F.R.S., Professor of Geology and Mineralogy in the University 
of Dublin; Hon. Sec., Royal Dublin Society, ; 5 
XXVII.—The Lines of flow of Water in saturated Soils: explaining a simple 
Method for determining the Relation between the Distance apart 
of Ditches and the Height to which the saturating Water will 
rise with a given Rainfall, special reference being made to the 
Draining of Peat-Mosses. By Lewis F. Ricuarpson, 
aaa —Mendelian Characters among Short- Horn Cattle. By Jamus W1Lson, 
M.A., B.Sc., Professor ot Agriculture in the Royal College of 
Science, Dublin, : 4 ; ; ; : 
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