SCIENTIFIC PliOCEEDINGS. 



VOLUME XIII. 



1. A Seed-Bearing Irish Ptecidosperm, Crossotheca Honinghausi, Kidston 



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

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



2. Cousiderations and Experiments on the sapposed Infection of tlie Potato Crop 



with the Bliglit Fangas {Plujtophthora iiifestans) 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 Brown, b.so. 

 (April 15, 1911). Is. 



4. A Tliermo-Electric Method of Gryoscopy. 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). Gd. 



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



IV.-VI.) (June 28, 1911.) Is. Qd. 



9. The Occurrence of ArohuBopteris Tscliermaki, Stur, and of other Species of 



ArcliEBopteris 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.) 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 Lows 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. 



