SCIENTIFIC PROGEEDINaS. 



VOLUME XIII. 



1. A Seed-Bearing Iiish Pfcericlosperin, Grossotheoa HoningJiMisi, Kidston 



(Lyginodendron oldhamium, Williamson). By T. Johnson, d.sc, p.l.s. 

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



2. Oonsiderafcions and Espedments on the supposed Infection of the Potato Crop 



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

 derived directly from the j planted Tubers. By George H. Pethybridgb, 

 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-Electrie ^Method of Gryoscopy. By Henry H. Dixon, sc.d., f.b.s. 



(April 20, 1911). Is. 



5. A Method of Exact Determination of the Oontinaous Ohaage in Absolute 



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

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



6. Eadiaut Matter. By Johnt 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 feopteris a Pteridosperm ? By T. Johnson, d.so., f.l.s. (Plates 



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



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



Archaeopteris 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.) Qd. 



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



Atmosphere. By John Joly, sc.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.) Is. 



