[ iv ] 
VIII. Experiments to determine the effect of Impact , Vibratory Action , and long- 
continued Changes of Load on Wr ought-iron Girders. By W. Fairbairn, LL.B., 
F.B.S page 311 
IX. The Bakerian Lecture . — Contributions to Molecular Physics. — Being the Fifth 
Memoir of Besearches on Badiant Heat. By John Tyndall, F.B.S. , Member of 
the Academies and Societies of Holland , of Geneva , Gottingen , Zurich , Halle , 
Marburg , Breslau , Upsala, la Societe Philomathique , Paris, Cam. Phil. Soc. &c. ; 
Professor of Natural Philosophy in the Boyal Institution 327 
X. On Plane Water-Lines in two Dimensions. By William John Macquorn Bankine, 
C.E., LL.D., F.B.SS. L. & E., Associate of the Institution of Naval Archi- 
tects, &c 369 
XI. On the Joint-Systems of Ireland and Cornwall, and their Mechanical Origin. By 
the Bev. Samuel Haughton, M.D., Fellow of Trinity College , Dublin . . 393 
XII. On the Spectra of some of the Fixed Stars. By William Huggins, F.B.A.S. , 
and W. A. Miller, M.D., LL.D., Treas. & V.P.B.S., Professor of Chemistry, 
King's College, London 413 
XIII. On the Spectra of some of the Nebulae. By William Huggins, F.B.A.S. A 
Supplement to the Paper “ On the Spectra of some of the Fixed Stars. By 
William Huggins, F.B.A.S., and W. A. Miller, M.D., LL.D., Treas. and 
V.P.B.S." Communicated by Professor W. A. Miller, M.D., LL.D. . . 437 
XIV. On the Arrangement of the Muscular Fibres in the Ventricles of the Vertebrate 
Heart, with Physiological Bemarks. By James Bell Pettigrew, M.D. Edin. ; 
Assistant in the Museum of the Boyal College of Surgeons of England ; Extra- 
ordinary Member and late President of the Boyal Medical Society of Edinburgh, 
&c. &c. Communicated by John Goodsir, Esq., F.B.SS. L. and E., Professor of 
Anatomy in the University of Edinburgh 445 
XV. On the Brain of a Bushwoman ; and on the Brains of two Idiots of European Descent. 
By John Marshall, F.B.S., Surgeon to University College Hospital . . . 501 
XVI. A Second Memoir on Skew Surfaces, otherwise Scrolls. By A. Cayley, F.B.S. 559 
XVII. Algebraical Besearches, containing a disquisition on Newton’s Buie for the Dis- 
covery of Imaginary Boots, and an allied Buie applicable to a particular class of 
Equations, together with a complete invariantive determination of the character of 
the Boots of the General Equation of the fifth Degree, &c. By J. J. Sylvester, 
M.A., F.B.S., Correspondent of the Institute of France, Foreign Member of the 
Boyal Society of Naples, etc. etc.. Professor of Mathematics at the Boyal Military 
Academy , Woolwich 579 
