LIST OF ILLUSTRATIONS. 
Plate I. — Mr. George W. Callender on the Formation of some of the Snbaxial 
Arches in Man. 
Plate II. — Mr. C. F. Varley on Polarization of Metallic Surfaces in Aqueous Solutions. 
Plates III. to X. — Mr. W. K. Parker on the Structure and Development of the Skull 
of the Common Frog. 
Plates XI. to XIV. — Professor Owen on the Fossil Mammals of Australia. 
Plate XV. — Professor W. J. Macquorn Rankine on the Mathematical Theory of Stream- 
lines. 
Plates XVI. to XXI. — Mr. E. J. Reed on the Unequal Distribution of Weight and 
Support in Ships. 
Plate XXII. — Messrs. Roscoe and Thorpe on the Measurement of the Chemical In- 
tensity of Total Daylight in the Eclipse of 1870. 
Plates XXIII. to XXIX. — Professor W. C. Williamson on the Organization of the 
Fossil Plants of the Coal-measures. 
Plates XXX. to XLII. — Dr. A. Gunther’s Description of Ceratodus. 
Plates XLIII. and XLIV. — Messrs. Gibson and Barclay on Measurements of Specific- 
Inductive Capacity of Dielectrics. 
