SCIENTIFIC PROCEEDINGS. 



VOLUME XIII. 



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



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

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



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



with the Blight Fungus {Phytophthora infestaiis) 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 tlie 

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

 (April 1.5, 1911). 1.5. 



4. A Tliermo-Electrie Method of Oryoscopy. By Henry H. Dixon, sc.d., f.r.s. 



(April 20, 1911V 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.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.sc 



(June 12, 1911.) Is. 



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



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



9. The Occurrence of Aroh/Bopteris Tschernaki, Stur, and of other Species of 



ArchfBopteris in Ireland. By T. Johnson, d.sc, f.l.s. (Plates VII., VIII.) 

 (June 28,U911.) 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 Radium Emanation in the Soil and its Escape into the 



Atmosphere. By John Joly, scd., f.r.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. 



13. Forbesia cancellata, gen. et sp. nov. (Sphenopteris, sp., Baily.) By 



T. Johnson, d.sc, f.l.s. (Plates XIII. and XIV.) (January, 1912. Is. 



14. Thelnheritance of the Dun Coat-Colour in Horses. By James Wilson, m.a., b.sc. 



(January, 1912.) Is. 



15. On the Vacuum Tube Spectra of the Vapours of some Metals and Metallic 



Chlorides. Part I. — Cadmium, Zinc, ThaUium, Mercury, Tin, Bismuth, 

 Copper, Arsenic, Antimony, and Aluminium. By James H. Pollok, d.sc. 

 (Plates XV. and XVI.) (February 21, 1912.) Is. 



