I. & HH: 
IIL-XI. 
XII. & XIII. 
XIV. 
XV. 
XVI. 
XVIT-XIX. 
XX, 
XXI. 
PLATES. 
Illustrative of Dr. G. E. Allan’s Paper on the Magnetism 
of Basalt and the Magnetic Behaviour of Basaltic Bars 
when Heated in Air. 
Illustrative of Dr. E. Weintraub’s Paper on the Arc in 
Metallic Vapours in an Exhausted Space. 
Illustrative of Mr. C. A. Chant’s Paper on the Variation - 
of Potential along the Transmitting Antenna in Wire- 
less Telegraphy. 
Illustrative of My. ‘8. J. Allan’s Paper on the Radioactivity 
of the Atmosphere. 
Illustrative of Prof. Karl Pearson’s Paper on a Novel 
. Instrument for Drawing Parabolas. 
Illustrative of Mr. T. C. Porter’s Paper on a Method 
of Mechanically Reinforcing Sounds. 
Illustrative of Mr. S. Skinner’s Paper on the Occurrence of 
Cavitation in Lubrication. 
Illustrative of Messrs. Simmance and Abady’s Paper on 
the Simmance-Abady “ Flicker” Photometer. 
Illustrative of Prof. R. W. Wood’s Paper on some new 
Cases of Interference and Diffraction. 
XXII. & XXIII. Illustrative of Dr. W. Watson’s Paper on a Quartz- 
XXIV. 
Thread Vertical Force Magnetograph. 
Illustrative of Mr. H. Darwin’s Paper on an Electric 
Thermostat. 
XXV.& XXVI. Illustrative of Mr. J. Barnes’s Paper on the Analysis 
XX VII. 
of Bright Spectrum Lines. | 4 
Illustrative of Mr. W. Bennett’s Paper on Non-homocentric 
Pencils, and the Shadows produced by them. 
ERRATUM. 
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