PLATES. 



I. Illustrative of Dr. J. D. Dana's Paper on the Origin of Coral 

 Reefs and Islands. 



II., III., & IV. Illustrative of Prof. Oliver Lodge's Paper on the 

 Stream-Lines of Moving Vortex-Rings. 



V. Illustrative of Dr. J. A. Fleming's Paper on the Use of Daniell's 

 Cell as a Standard of Electromotive Force. 



VI. & VII. Illustrative of Dr. J. A. Fleming's Paper on the Distribution 

 of Electric Currents in Networks of Conductors. 



VIII. Illustrative of Mr. J. Buchanan's Paper on the Thermoelectric 

 Position of Carbon. 



IX. Illustrative of Mr. F. Stenger's Paper on the Electric Conductivity 

 of Gases. 



X. Illustrative of Prof. 0. Reynolds's Paper on the Dilatancy of Media 

 composed of Rigid Particles in Contact. 



XI. Illustrative of Mr. T. Gray's Paper on Measurements of the Intensity 

 of the Horizontal Component of the Earth's Magnetic Field. 



