SCIENTIFIC PROCEEDINaS. 



VOLUME XIII. 



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



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

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



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



with the Blight Fungus {Phytophthora infestans) by means of Mycelium 

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

 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-Eleotrie Method of Cryoseopy. 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.o.so. (lond). (May 16, 1911). 6d. 



6. Eadiant Matter. By John Joly, so.d., p.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 Arehseopteris a Pteridosperm ? By T. Johnson, d.so., f.l.s. (Plates 



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



9. The Occurrence of Archceopteris Tschermaki, 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., so.d., f.r.s. (July, 



1911.) 6rf. 



11. On the Amount of Kadium 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 



Eocks. By E. A. Newell Aebes, m.a., f.l.s., f.g.s. (January, 

 1912.) Is. 



DUBLIN : PKINTED AT THE UNIVERSITY PRUSS BY PONSONBY AVU GIBBS. 



