SCIENTIFIC PllOCEEDINOS. 



VOLUME XIII. 



1. A Seed-Bearing Irish Pfceridosperm, Grossotheaa Hdningh-iusi, Kidston 



{Lyginodendron oldhamium, Williamson). By T. Johnson, 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 Blight Ptingas (Phytophthora, infestans) by means of Mycelium 

 derived directly from the planted Tubers. 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 jBrown, b.so. 

 (April 15, 1911). Is. 



4. A Thermo-Electric Method of Cryoscopy By HeNRy H. Dixon, sc.d., f.b.s. 



(April 20,'1911). Is. 



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

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

 By William J. Lyons, b.a., a.r.c.so. (lond.). (May 16, 1911). 6d. 



6. Radiant 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 Arc seopteris a Pteridosperm ? By T. Johnson, d.so., f.l.s. (Plates 



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



9. The Occurrence of ArcJuBopteris Tsehermald, Stur, and of other Species of 



Arehseopteris in Ireland. By T. Johnson, d.so., 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.) U. 



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



Atmosphere. '(By John Joly, so.d., f.k.s., and Louis 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.) l.s. 



