LIST OF ILLUSTRATIONS. 
Plate I. Professor Tyndall on the Absorption and Eadiation of Heat by Gases and 
Vapours. 
Plates II. III. IV. — Mr. C. V. Walker on Magnetic Storms and Earth-Currents. 
Plate V.— Messrs. Smith and Evans on the Effect of the Length of the Compass- 
Needle on the Deviations of the Compass. 
Plates VI. VII. VIII. — Mr. S. J. A. Salter on the Structure and Growth of the Tooth 
of Echinus. 
Plates IX. X. XI. — Mr. B. Stewart on the Great Magnetic Disturbance of August 28 
to September 7, 1859. 
Plates XII. XIII. XIV. XV. — Mr. J. B. Lawes, Dr. Gilbert, and Dr. Pugh on the 
Sources of the Nitrogen of Vegetation, &c. 
Plates XVI. XVII. — Mr. Lubbock on the Generative Organs, and on the Formation of 
the Egg in the Annulosa. 
Plates XVIII. XIX. — Dr. E. Frankland on the Influence of Atmospheric Pressure 
upon some of the Phenomena of Combustion. 
Plates XX. XXI. XXII. XXIII. — Mr. Mallet on the Transit-Velocity of Earthquake 
Waves. 
Plates XXIV. XXV. XXVI. XXVII. XXVIII. XXIX. XXX. XXXI.— The Earl 
of Eosse on the Construction of Specula of 6-feet Aperture. 
Plates XXXII. XXXIII. XXXIV. XXXV. XXXVI.— Dr. Smith on the Elimination 
of Urea and Urinary Water. 
