LIST OF ILLUSTRATIONS. 
Plates I., II. — Mr. W. Huggins on the Spectra of some of the Chemical Elements. 
Plate III. — Captain Haig on the Magnetic Elements in British Columbia, Washington 
Territory, and Vancouver Island. 
Plates IV., V. — Mr. Prestwich on the Geology of the Deposits containing Flint Imple- 
ments, and on the Loess. 
Plates VI., VII. — Dr. Fairbairn on the Effect of Impact, Vibratory Action, and long- 
continued Changes of Load on Wrought-Iron Girders. 
Plates VIII., IX. — Dr. W. J. Macquorn Rankine on Plane Water-Lines. 
Plates X., XI. — Mr. W. Huggins and Dr. W. A. Miller on the Spectra of some of the 
Fixed Stars. 
Plates XII. to XVI. — Dr. Pettigrew on the Arrangement of the Muscular Fibres in the 
Ventricles of the Vertebrate Heart. 
Plates XVII. to XXIII. — Professor Marshall on the Brain of a Bushwoman ; and on 
the Brains of two Idiots of European Descent. 
Plates XXIV., XXV. — Professor Sylvester on the Real and Imaginary Roots of Equa- 
tions. 
