SCIENTIFIC PROCEEDINGS. 



VOLUME XIII. 



1. A Seed-Bearing Irish Pteridospertn, Grossotheca Roiiinghausi, Kidstoii 



{Lygbwdendron oldhammin, Williamson). |By T. Johnson, d.sc, f.l.s. 

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



2. Considecations and Bxperimeats on the supposed Infection of the Potato Crop 



with the Blight Fuugiis {Phytophthora infestans) 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.sc. 

 (April 15, 1911). Is. 



4. A Tliermo-Eleetric Method of Cryoscopy. 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.c.sc. (lond.). (May 16, 1911). 6d. 



6. Radiant Matter. By .John Joly, sc.d., f.r.s. (June 9, 1911.) Is. 



7. The Inlieritance of Milk- Yield in Cattle. By James Wilson, m.a., b.sc. 



(June 12, 1911.) Is. 



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



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



9. The Occurrence of Arcltieopterii Tscheniuiki,, Stur, and of other Species of 



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

 (June 28,J1911.) Is. 



10. Award of the Boyle Medal to Professor John Joly, m.a., so.d., f.r.s. (July, 



1911.) Gd. 



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. 



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. The Inheritance 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, Thallium, Mercury, Tin, Bismuth, 

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

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



