SCIENTIFIC PROCEEDINGS. 



VOLUME XIII. 



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



[Lijginodendron oldhamium, Williamson). By T. Johnson, d.sc, f.l.s. 

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



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



with the Blight Pungas {Phijtophthora infestans) by means of Mycelium 

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

 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 

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

 (April 15, 1911). Is. 



4. A Thermo-Electric Method of Oryoscopy. By Henry H. Dixon, so.d., f.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.so. (lond.). (May 16, 1911). 6d. 



6. Eadiaut 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 Archfeopteris a Pteridosperm? By T. Johnson, d.sc, f.l.s. (Plates 



IV.-VI.) (June 28, 1911.) Is. 6d. 



9. The Occurrence of Archmopteris Tschennaki, Stur, and of other Species of 



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



(June 28, 1911.) Is. 



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



1911.) Qd. 



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



Atmosphere. By John Joly, sc.d., f.k.s., and Loais B. Smyth, b.a. 

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



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



Eocks. By E. A. Newell Arber, m.a., f.l.s., f.g.s. (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 Wu^son, m.a., b.sc. 



(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.sc 

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



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



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

 m.a. (February 21, 1912.) &d. 



17. Improvements in Equatorial Telescope Mountings. By Sir Howard Geubb, 



F.R.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. E. G. Atkins, m.a., a.i.c. (April 9, 

 1912.) 6d. 



