SCIENTIFIC PROCEEDINGS. 



VOLUME XIII. 



1. A Seed-Bearing Irish Pteridosperm, Grossotheca Honinghausi, Kidston 



{Lyginodendron oldhamium, Williamson). By T. Johkson, d.so., f.l.s. 

 (Plates I.-III.) (March, 1911.) Is. 



2. Considerations and Experiments on the supposed Infection of the Potato Crop 



with the Bliglifc Paiigas {Phytophthom injestans) by means of Mycelium 

 derived directly from the planted Tubers. By George H. Pethybridgb, 

 B.sc, PH.D. (March, 1911.) Is. 

 8. Mechanical Stress and Magnetisation of Nickel (Part II.), and the Subsidence 

 of Torsional Oscillations in Nickel and Iron Wires when subjected to the 

 Influence of Longitudinal Magnetic Fields. By William Brown, b.so. 

 (April 15, 1911). Is. 



4. A Tliermo-Electric Method of Cryoscopy. By Henr? H. Dixon, sc.d., p.r.s. 



(April 20, 1911^. Is. 



5. A Method of Exact Determination of the Continuous Change in Absolute 



Density of a Substance, e.g. Wax, in passing through its Fusion Stage. 

 By William J. Lyons, b.a., a.r.c.sc. (lond.). (May 16, 1911). Qd. 



6. Kadiant Matter. By John Joly, sc.d., f.r.s. (June 9, 1911.) Is. 



7. The Inheritance of Milk-Yield in Cattle. By James Wilson, m.a., b.so. 



(June 12, 1911.) Is. 



8. Is Archffiopteris a Pteridosperm ? By T. Johnson, d.so,, f.l.s. (Plates 



IV.-VL) (June 28, 1911.) Is. &d. 



9. The Occurrence of ArchcBopteris Tschermahi, Stur, and of other Species of 



Archieopteris in Ireland. By T. Johnson, d.sc, f.l.s. (Plates VII. and VIII.) 

 (June 28, 1911.) Is. 



10. Award of the Boyle Medal to Professor John Joly, m.a., sc.d., f.r.s. (July, 



1911.) U. 



11. On the Amount of Radium Emanation in the Soil and its Escape into the 



Atmosphere. By John Joly, sc.d., f.r.s., and Lonis B. Smyth, b.a. 

 (Plate IX.) (August, 1911.) Is. 



12. Contributions to our Knowledge of the Floras of the Irish Carboniferous 



Rocks. By E. A. Newell Arber, m.a., f.l.s., f.g.s. (Plates X.-XII.) 

 (January, 1912.) Is. 



13. Forbesia cancellata, gen. et sp. nov. (Sphenopteris, sp., Baily.) By 



T. Johnson, d.sc, f.l.s. (Plates XIII. and XIV.) (January, 1912.) Is. 



14. The Inheritance of the Dun Coat-Colour in Horses. By James Wilson, m.a., b.so. 



(January, 1912.) Is. 



15. On the Vacuum Tube Spectra of the Vapours of some Metals and Metallic 



Chlorides. Part I. — Cadmium, Zinc, Thallium, Mercury, Tin, Bismuth, 

 Copper, Arsenic, Antimony, and Aluminium. By James H. Pollok, d.so. 

 (Plates XV. and XVI.) (February 21, 1912.) Is. 



16. Changes in the Osmotic Pressure of the Sap of the Developing Leaves of 



Syringa vulgaris. By Henry H. Dixon, sc.d., f.r.s., and W. R. G. Atkins, 

 M.A. (February 21, 1912.) 6d. 



17. Improvements in Equatorial Telescope Mountings. By Sis Howard Grubb, 



F.K.S.. (Plates XVII.-XIX.) (March 26, 1912.) Is. 



18. Variations in the Osmotic Pressure of the Sap of Ilex aquifolium. By 



Henry H. Dixon, sc.d., f.r.s., and W. R. G. Atkins, m.a., a. i.e. (April 9, 

 1912.) 6d. 



