SCIENTIFIC PROCEEDINOS. 



VOLUME XIII. 



1. A Seed-Bearing Irish Pteridosperm, Grossotheca Rdninghjt,tisi, Kidston 



{Lyginodendron oldhamium, Williamson). By T. Johnson, d.sc, f.l.s. 

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



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



with the Blight Fangas {Phytophthora mfestans) by means of Mycelium 

 derived directly from the planted Tubers. f"By George H. Pethybridge, 

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



3. 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 Thermo-Electric Method of Oryoscopy. By Henry H. Dixon, sc.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.sc. (lond.). (May 16, 1911). 6d. 



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



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



9. The Occurrence of Archaopteris Tschermaki, Stur, and of other Species of 



Archfeopteris 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.) Gd. 



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



Atmosphere. By 'JSokn Joly, sc.d., f.k.s., and Lodis 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. (January, 

 1912.) Is. 



