LIST OF ILLUSTRATIONS. 
Plates I. to VIII. — Mr. W. K. Parker on the Structure and Development of the Skull 
in the Salmon. 
Plates IX. and X. — Mr. Robert Mallet on Volcanic Energy. 
Plates XI. to XIII. — Mr. J. Norman Lockyer on Spectrum-Analysis in connexion 
with the Spectrum of the Sun. 
Plates XIV. to XVII. — -Mr. W. Crookes on the Atomic Weight of Thallium. 
Plate XVIII.-— The Astronomer Royal— -Magnetical Observations in the Britannia 
and Conway Tubular Iron Bridges. 
Plates XIX. to XXI.-— The Rev. Stephen J. Perry— Magnetic Survey of Belgium 
in 1871. 
Plates XXII. to XXXI.— Professor W. C. Williamson on the Organization of the 
Fossil Plants of the Coal-measures. 
Plate XXXII. — Mr. Dugald M‘Kichan — Determination of the Number of Electro- 
static Units in the Electromagnetic Unit. 
Plate XXXIII,— Mr. E. A. Schafer on the Minute Structure of the Leg-muscles of the 
Water-beetle. 
Plate XXXIV.— Mr. F. Chambers on the Diurnal Variations of the Wind and Barometric 
Pressure at Bombay. 
Plate XXXV. to XL.— Dr. W. Kowalevsky on the Osteology of the Hyopotamidce. 
