SCIENTIFIC PROCEED INaS. 



VOLUME XIII. 



1. A Seed-Bearing Irish Pfceridosperm, Grossotheoa Hdninghj,usi, Kidston 



(Lyginodendron oldhamiiom, Williamson). By T. Johnson, d.sc, f.l.s. 

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



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



with the Blight Fungas {Phi/tophthora injestans) by means of Mycelium 

 derived directly from the planted Tubers , By George H Pethtbridge, 

 B.so., 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-Eleotric 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). Qd. 



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.so. 



(June 12, 1911.) Is. 



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



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



DUBLIN : PRINTEIl AT THE UNIVKltSlTY HItUSS KY I'OSSONBV AND OIBBS. 



