LIST OF ILLUSTRATIONS. 
Plates 1 to 12. — Mr. E. Ray Lankester on the Developmental History of the Mollusca. 
Plates 13 to 24. — Captain Noble and Mr. F. A. Abel on Fired Gunpowder. 
Plate 25. — Mr. J. B. N. Hennessey on the Atmospheric Lines of the Solar Spectrum. 
Plates 26 to 28. — 'General Sir Edward Sabine on Terrestrial Magnetism. 
Plates 29 to 32. — Dr. E. Klein on the Smallpox of Sheep. 
Plates 33 to 45. — Dr. A. Gunther on Gigantic Land-Tortoises. 
Plates 46 & 47. — Mr. C. S. Tomes on the Development of the Teeth of the Newt, Frog, 
Slowworm, and Green Lizard. 
Plate 48. — Mr. C. S. Tomes on the Structure and Development of the Teeth of Ophidia. 
Plate 49. — No Plate. 
Plates 50 to 52. — Mr. W. Lassell on Polishing the Specula of Reflecting Telescopes. 
Plates 53 & 54. — Messrs. C. and F. Chambers on the Mathematical Expression of 
Observations of Complex Periodical Phenomena. 
Plates 55 to 58. — Professor Allman on the Structure and Development of Myriothela. 
Plates 59 to 64. — Messrs. Lockyer and Seabroke on Spectroscopic Observations of the 
Sun. 
Plates 65 to 68. — Mr. J. Prestwick on Submarine Temperatures. 
