VI CONTENTS. 



VIII. A Note on the Little Owl Carine Noctua (Scop.), and its 



Food. By T. A. Coward, F.Z.S. pp. i — ii 



(Issued separately, Janvary 31st, tC)I2.) 



IX. On the Modes of Rupture of an Open Hemispherical 

 Concrete Shell under Axial Pressure. By J. R. 



GwYTHER, M.A. With I PL pp. i— 8 



(Issued separately, April zgtli, IQ12.) 



X. The Formal Specification of the Elements of Stress in 

 Cartesian, and in Cylindrical and Spherical Polar 

 Coordinates. By R. F. Gwyther, M.A. IVith 

 Table ... ... ... ... ... ... pp. i — 13 



{I ssi<ed separately. May 13th, igu.) 



XI. The presence of Maxilluloe in Larvje of Dytiscidns. By 



Joseph Mangan, M.A. IVilh 2 Text-Jigs. ... pp. i — 6 

 (Issued separately, May zoth, IQI2.) 



XII. On the Interpretation of the Vascular Anatomy of the 



Ophioglossacea;. By William H. Lang, M.B., 



D.Sc, F.R.S. JVJfh 6 Text-Jigs pp. i— 15 



{Issued separately. June 4th, igi2.) 



XIII. On Search-Lights for the Mercantile Marine. By 



Henry Wilde, D.Sc, D.C.L., F.R.S. ... pp. 1—5 



(Issued separately, May 20th, igr2.) 



XIV. The Volatility of Sulphur and its action on Water. 



By Francls Jones, M.Sc. F.R.S. E., F.C.S. JVitk 



1 PL pp. I— 4 



(Issued separately, June 15th, igi2.) 



XV. The Smelt in Rostherne Mere. By T. A. Coward, 



F.Z.S. pp. I— 2 



(Issited separately, June bth, igi2.) 



X\T. A Note on the .Submerged Forest at Llanaber, Barmouth. 

 By T. G. B. OsBORN, M.Sc. IVtth 2 Ph. and 



2 Text-figs. ... ... ... ... ... ... pp. I — 10 



(Issued separately, September 5th, igi2.) 



XVII. On Calamites ( Calamitina)variaiis, Sternb., var. insigtiis. 



Weiss. By Mary A. Johnstone, B.Sc. With i PL pp. i — 16 



{Issued separately, September 26th, igi2.) 



