IV 



Contents. 



PABT II. 



PAGE 



XL— Floating Eefracting Telescope. By Sir Howard Grubb, F.R.S., 



Vice-President, Royal Dublin Society. (Plates VII.-IX.), . 133 



XII. — Registration of Star-transits by Pbotograpby. By Sir Howard 



Grubb, F.R.S., Vice-President, Royal Dublin Society, . . 138 



XIII. — A New Form of Dipleidoscope. By Sir Howard Grubb, F.R.S. 

 Vice-President, Royal Dublin Society. (Plate XL), 



XIV. — A Circumferentor. By Sir Howard Grubb, F.R.S., Vice 

 President, Royal Dublin Society. (Plate XL), 



XV. — A New Form of Position-finder for adaptation to Ships' Com 

 passes. By Sir Howard Grubb, F.R.S. , Vice-President 

 Royal Dublin Society. (Plate XII.), .... 



XVI. — An Improved Simple Form of Potometer. By G. H. Pethybridge 

 Ph.D., B.Sc, 



141 

 143 



146 

 149 



153 



XVII. — "Willow Canker : Physalospora (Botryosphceria) gregaria, Sacc 

 By T. Johnson, D.Sc., F.L.S., Professor of Botany in the Royal 

 College of Science, and Keeper of the Botanical Collections 

 National Museum, Dublin. (Plates XIII.-XV.), . 



XVIII. — The Comparison of Capacities in Electrical "Work : an Application 

 of Radio-active Substances. By J. A. McClelland, M.A., 

 Professor of Experimental Physics, University College, Dublin, 167 



XIX. — Preliminary Note on the Action of the Radiations from Radium 

 Bromide on some Organisms. By Henry H. Dixon, D.Sc, 

 Assistant to the Professor of Botany, University of Dublin ; 

 and J. T. Wigham, M.D., Assistant to the Lecturer in 

 Pathology in Trinity College, Dublin. (Plates XVI.-XVIIL), 178 



XX. — An Experiment on the Possible Effect of High Pressure on the 



Radio-activity of Radium. By W. E. Wilson, D.Sc, F.R.S., . 193 



XXL— On the Reactivity of the Alkyl Iodides. By F. G. Donnan, 



M.A., Ph.D., 195 



XXII. — On the Structure of "Water-jets, and the effect of Sound thereon. 

 By Philip E. Belas, Science Scholar, Department of Agri- 

 culture and Technical Instruction for Ireland, Royal College 

 of Science, Dublin. (Plates XIX.-XXIL), .... 203 



XXIII. — Remarks on the Cases of Carbon Monoxide Asphyxiation that 

 have occurred in Dublin since the addition of Carburetted 

 Water-gas to the Ordinary Coal-gas. By E. J. McWeeney, 

 M.A., M.D., D.P.H., M.R.I. A., Professor of Pathology at 

 the Catholic University Medical School ; Pathologist to the 

 Mater Misericordiee Hospital, Dublin, 217 



XXIV. — Photographs of Spark-Spectra from the Large Rowland Spec- 

 trometer in the Royal University of Ireland. Part III. : The 

 Ultra- Violet Spark-spectra of Platinum and Chromium. By 

 W. E. Adeney, D.Sc, A.R.C.Sc.L, Curator and Examiner in 

 Chemistry in the Royal University of Ireland, . . . 235 



XXV. — The Pre-glacial Raised Beach of the South Coast of Ireland. By 

 W. B. Wright, B.A., and H. B. Muff, B.A., F.G.S. (Plates 

 XXIII.-XXXL), 250 



