PEOCEEDINGS 



ROYAL IRISH ACADEMY. 



S CIE l^T C E 



Sek. 11., Y()],. IV.] JANUAEY, 1888. [No. 6. 



CONTENTS. 



PAGK 



XL. — On some Theorems in Determinants. By A. H. Anglix, M.A., 



F.R.S. (Edin.j, &c., ........ 64a 



XLI. — On the possibility of determining the Distance of a Double Star by 

 Measures of the Relative Velocities of the Components in the 

 Line of Sight. By AirrnuE A. E\.MBArT, .... 663 



^XLIL — Authenticated Materials towards a Land and Freshwater Molluscan 

 Fauna of Ireland. By Joiix W. Taylor and W. Dexison, 

 Roebuck, F.L.S. [Communicated hj W. F. de Vismcs Kane, 

 M.R.I.A.], 672 



XLIIL — Report on the Flora of the Shores of Lough Ree. By Richakd jL 



JUkkixgtox, M.A., LL B., F.L.S., and Richakd P. Yowell, . 69li 



XLIV. — On the Distribution of Temperature over Great Britain and Ireland. 

 By Hexhy Hexnessy, F.R.S., Professor of Applied Mathematics 

 in the Royal College of Science, Dublin. (Plate YL), . . 709 



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