CONTENTS. 



PART I. 



I. Researches on Heat. FOURTH SERIES. On the E/ect of the Mechanical 

 Texture of Screens on the immediate transmission of Radiant Heat. 

 By JAMES D. FORBES, Esq., F.R.SS.L. # E., Professor of Natural 

 Philosophy in the University of Edinburgh, . . . . Page 1 

 II. Account of some Additional Experiments on Terrestrial Magnetism made 

 in different parts of Europe in 1837. By JAMES D. FORBES, Esq., 

 F.R.SS.L. $E., $c., Professor of Natural Philosophy in the Univer- 

 sity of Edinburgh, 27 



III. On the Plane and Angle of Polarization of Light Reflected at the surface, 



of a Crystal. By The Rev. P. KELLAND, A.M., F.R.SS.L. $ E., 

 late Fellow of Queen's College, Cambridge ; Professor of Mathematics, 

 Qc. in the University of Edinburgh, . . . . . 37 



IV. On certain Physiological Inferences which may be drawn from the Study 



of the Nerves of the Eyeball. By W. P. ALISON, M.D., Professor of 

 the Theory of Medicine in the University of Edinburgh, . , 67 



V. Notice of the Fossil Fishes found in the Old Red- Sandstone formation of 

 Orkney, particularly of an undescribed species, Diplopterus Agassis. 

 By T. S. TRAILL, M.D., F.R.S.E., Professor of Medical Jurispru- 

 dence in the University of Edinburgh, ..... 89 



VI. On the mode in which Musket-Bullets and other Foreign Bodies become 

 inclosed in the Ivory of the Tusks of the Elephant. (Plate I.) By 

 JOHN GOODSIR, Esq., M.W.S. Communicated by Professor SYME, 93 



VII. On the Theory of Waves. Part II. By The Rev. P. KELLAND, M.A., 

 F.R.SS.L. $ E., F.C.P.S., late Fellow of Queen's College, Cam- 

 bridge; Professor of Mathematics, fyc., in the University of Edinburgh, 101 



VIII. Examination and Analysis of the Berg-Meal, or Mineral Flour, found in 

 the Parish of Degersfors, in the Province of West Bothnia, on the con- 

 fines of Swedish Lapland. By THOMAS STEWART TRAILL, M.D., Pro- 

 fessor of Medical Jurisprudence in the University of Edinburgh, . 145 



