Vol. 56 : Part II. 



MEMOIRS AND PROCEEDINGS 



OF 



THE MANCHESTER 



LITERARY & PHILOSOPHICAL 



SOCIETY, 1911-1912. 



CONTENTS 



Memoirs : ~" 



IX. On the Modes of Rupture of an Open Hemispherical Concrete 

 Shell under Axial Pressure. By J. R. Gwyther, M.A. JVt^h 

 I PI. - pp. I— 8. 



(Issued separately, Apy il 2qIJi. iqi2.) 



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. 



(Issued separately, May isth, igi3.) 



XI. The Presence of Maxillulae in Larvae of Dytiscidae. By Joseph 



Mangan, M.A. With 2 Text-figs. pp. i— 6. 



(Issued separately., May 2oth, i()i2.) 



XII. On the Interpretation of the Vascular Anatomy of the Ophio- 

 glossaceae. By William H. Lang, M.B., D.Sc, F.R.S. 

 IVith 6 Text-Jigs. pp. I— 15. 



(Issued separately, June 4.th, IQ13.) 



XIII. On Search- Lights for the Mercantile Marine. By Henry Wilde, 



D.Sc, D.C.L., F.R.S. pp. i— 5. 



(Issued separately. May 20th, igi2.) 



XIV. The Volatility of Sulphur and its Action on Water. By Francis 



Jones, M.Sc, F.R.S. E, F.C.S. JVith i Pi. - - - - pp. i— 4. 



(Issued separately, June istli, 1Q12.) 



XV. The Smelt in Rostherne Mere. By T. A. Coward, F.Z.S. - - pp. i - 2. 



(Issued separately, June 6.'//, 1912.) 



Proceedings. With Map ________ pp. ix. — xxxvi. 



MANCHESTER: 

 36, GEORGE STREET. 



Ipricc 3Four SbfUings anD Sijpence. 



July 24th, igi2. 



