SCIENTIFIC PROCEE DINGS. 



VOLUME XIII. 



1. A Seed-Bearing Irish Pfceridosperm, Grossotheoa HoninghMisi, Kidston 



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

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



2. Consideratioas and Experimeats on the sapposed lafeotion of the Potato Crop 



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

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

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



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

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

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

 (April 15, 1911). Is. 



4. A Tliermo-Electric Method of Cryoscopy By Henry H. Dixon, so.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, in passing through its Fusion Stage. 

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



('}. 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.sc. 



(June 12, 1911.) Is. 



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



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



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



Arehseopteris 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., so.d., f.r.s. (July, 



1911.) 6d. 



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 Lodis 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 



