LIST OF ILLUSTRATIONS. 
Plates I. to III. — The Rev. Stephen J. Perky on the Magnetic Survey of the West of 
France. 
Plates IV. to VII. — Professor Owen on Remains of a large extinct Lama from Quater- 
nary Deposits in the Valley of Mexico. 
Plate VIII. — Professor Owen on the Molar Teeth, Lower Jaw, of Macrauchenia pata- 
chonica. 
Plates IX. to XI. — Mr. J. Wood on Varieties of Muscles. 
Plates XII. to XXI. — Dr. J. Cleland on the Variations of the Human Skull. 
Plates XXII. & XXIII. — Mr. N. Story-M askelyne on the Mineral Constituents of 
Meteorites. 
Plate XXIV. — The Astronomer Royal on Terrestrial Galvanic Currents. 
Plates XXV. & XXVI. — Dr. Hubert Airy on a distinct form of Transient Hemiopsia. 
Plates XXVII. to XXIX. — General Sir Edward Sabine on Terrestrial Magnetism. 
Plate XXX. — Messrs. Roscoe and Thorpe on the Relation between the Sun’s Altitude 
and Chemical Intensity. 
Plate XXXI. — Messrs. De La Rue, Stewart, and Loewy’s Researches on Solar Physics. 
Plates XXXII. to XXXIV. — Professor Jevons on the Mechanical Performance of 
Logical Inference. 
Plates XXXV. to L. — Professor Owen on the Fossil Mammals of Australia. 
Plates LI. & LII. — Dr. G. W. Royston-Pigott on a Searcher for Aplanatic Images. 
