, THE 
OF THE 
ROYAL DUBLIN SOCIETY. 
CONTENTS. 
1.—Ooralloriiza innata R. Br., and its Mycorhiza. By A. VaucHan 
JeNNINGS, F¥.L.8., F.G.S., and Hewry Hanna, M.A., B.Sc. 
(Plates I. ‘and IL. ‘ : 
I. —Mining and Minerals in the Transvaal and Swazieland. By 
EE. Sr. Jonn Lysurn, M.H., A.R.C.Sc.1,, F.G.S. (Plate II1.), 
oan —A List of Irish Corallinaces, By T. JOuNSON, D.Sc. (Lond.), 
F.L.S., Professor of Botany, Royal College of Seience, and 
Keeper of the Botanical Collections, Science and Art Museum, 
Dublin; and Miss kh. Hensman, 
.—Notes on a Method of comparing the relative Opacities of Organic 
Substances to the X Rays. By Ernest A. W. Henry, B. A., 
—The Kieselguhr of Co. Antrim. By Jamus Hotms Potxox, B. Sc., be 
Vi. —0On the Correction of Errors in the Distribution of Time Signals. 
By Sir Howard Gruss, F.R.S., Vice-President, Royal al 
a Dublin Society. (Plates LV. and V. Jee : 
.—Proposal for the Utilization of the ‘‘ Marconi” System of Wir e- 
less Telegraphy for the Control of Public and other Clocks. 
By Str Howarp Gruss, F.R.S., Vice-President, R.D.S., 
—On a Hydro - Dynamical Hypothesis as to Electro - Mag netic 
| Actions. By Pror. Grorce Francis Fitz Gera, F. “R. 8., 
_ TX.—Note on the Results that may be expected from the ’ proposed 
Monster Telescope of the Paris Exhibition of 1900. By Str 
-Howarp Gruss, F.R.S., Vice-President, R.D.S. (Abstract), 
—On the Concentration of Soap Solution on the Surface of the 
Liquid. By Davin Henry Hart, B.A., 
‘The Rio Del Fuerte of Western Mexico, and its Tributaries. By 
Kinsiny Drypen Doytx, M.A., Assoc. M. Inst. C.E. oe 
Oy VES to XV.); é 
te on Improvements in the Means of causing Oceultations or 
_ Flashes in Buoy Lamps and Beacons in which the Lights 
Burn Continuously for a Month or a longer time. By JOHN 
3 R. Wiewam, M.R.I.A., 
—Survey of that Part of the Range of Nature’s Operations which 
__ Man is competent to study. By G. Jonnsronr Sronry, M.A., 
D.Sc., F.R.S. (Figures 1 to 6—6 as Plate), 
—Award of the Boyle Medal to Guorcr JonnstonE STONEY, M. An 
D.Sc., F.R.S., at the Evening Scientific Meeting of the Royal 
Dublin Society, held March 22nd, 1899, ; A 
i WILLIAMS AND NORGATE, 
oe HENRIETTA-STREET, COVENT GARDEN, LONDON; 
20, SOUTH FREDERICK-STREET, EDINBURGH; 
anv 7, BROAD- STREET, OXFORD. 
1899. 
vy Price Four Shillings and Sixpence. 
- (N.S) OCTOBER, 1899. Part 1. 
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