SCIENTIFIC PROCEEDINGS. 



VOLUME XIII. 



1. A Seed-Bearing Irish _Pteridosperm, Crossotheca Roninghausi, Kidston 



{Lyginoclendron 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 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 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-EIectric Method of Cryoscopy. 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.o.so. (lond). (May 16, 1911). &d. 



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



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



9. Tlie Occurrence of ArchtBopteris Tscherniaki, Stur, and of other Species of 



Archffiopteris 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.) m. 



DUBLIN : I-HlNTEl) AT THE UNIVERSITY PllESS BV I'ONSONHV AND UIBKS. 



