CONTENTS. 
PART I. 
I. On the Circulation of Air observed in Kundt’s Tubes, and on some Allied Acoustical 
Problems. By Lord Rayleigh, D.C.L., F.R.S . page 1 
II. On the Solubility of Salts in Water at High Temperatures. By William A. 
Tilden, D.Sc., Bond., F.R.S., Professor of Chemistry in the Mason Science 
College, Birmingham, and W. A. Shenstone, F.I.C., F.C.S., Lecturer on 
Chemistry in Clifton College,.. Bristol .23 
III. The Influence of Pressure on the Temperature of Volatilization of Solids. By 
William Ramsay, Ph.D., and Sydney Young, D.Sc. Communicated by 
Sir Andrew C. Ramsay, LL.D., F.R.S. .37 
IY. Researches on Spectrum Photography in relation to New Methods of Quantitative 
Chemical Analysis .—Part I. By W. N. Hartley, F.R.S.E., &c., Professor of 
Chemistry, Royal College of Science, Dublin. Communicated by Professor 
Stokes, Sec.R.S .49 
V. Measurements of the Wave-lengths of Lines of High Refrangibility in the Spectra 
of Elementary Substances. By W. N. Hartley, F.R.S.E., dc., Professor of 
Chemistry, Royal College of Science, and W. E. Adeney, F.C.S., Associate of 
the Royal College of Science, Dublin. Communicated by Professor Stokes, 
LL.D., Sec.R.S .63 
VI. Experiments upon the Heart of the Dog with reference to the Maximum Volume 
of Blood sent out by the Left Ventricle in a Single Beat, and the Influence of 
Variations in Venous Pressure, Arterial Pressure, and Pulse-Rate upon the 
work done by the Heart. By Wm. H. Howell, A.B., Fellow of the Johns 
Hopkins University, Baltimore, and F. Donaldson, Jim., A.B. Communicated 
by Professor M. Foster, Sec.R.S .139 
