Page 
Recent Progress in Geodesy, J. F. Hayford.. 1 
Recent Progress in Astrophysics, J. G. Hagen. ... 11 # 
Recent Progress in Theoretical Astronomy, T. J. J. See. 17 
Linear Differential Equations, F. G. Radelfinger. 21 
The Language of Hawaii, E. D. Preston. 37 
Some Discontinuous and Indeterminate Functions, C. K. Wead. ... 65 
Vector Differentiation, A. Macfarlane. 73 
A Few Questions in Hydrodynamics, R. A. Harris. 93 
Recent Progress in Physical Instruments, C. F. Marvin. 101 
State of Progress of our Knowledge of the Tides, L. P. Shidy. .. . 117 
Modern Problems in Acoustics, C. K. Wead.. 129 
The Tendency of Methods for the Measurement of the Force of 
Gravity on the Ocean, G. W. Littlehales.. 135 
Recent Progress in Geodesy. 139 
The Progress of Astronomy in 1900, T. J. J. See. 145 
Progress in Astronomical Photometry, J. G. Hagen. . 151 
Progress of Pure Mathematics in 1900, F. G. Radelfinger. 157 
Recent Progress in Practical and Experimental Electricity, R. A. 
Fessenden . 167 
The Recognition of the Fourth Dimension, C. H. Hinton. 179 
On the Foundations of Geometry, and on Possible Systems of 
Geometry, H. F. Stecker. 205 
Application of Mathematics in Meteorology, F. H. Bigelow. 215 
Analytic Representation of Complex Functions, F. G. Radelfinger. 227 
New and Abridged Method of Finding the Locus of Geographical 
Position and the Compass Error, G. W. Littlehales. 233 
Atmospheric Friction with Special Reference to Aeronautics, A. F. 
Zahm. 247 
Obituary Notices: 
Marcus Baker, 1849-1903. 277 
Edward Clark, 1822-1902. 286 
William Harkness, 1837-1903. 292 
Adolph Lindenkohl, 1833-1904. 296 
John Wesley Powell, 1834-1902.. 300 
William Thomas Sampson, 1840-1902. 308 
Charles Anthony Schott, 1826-1901. 312 
David Smith, 1834-1903. 315 
Titian R. Peale, 1800-1885. 317 
The Progress of Science as Exemplified in Terrestrial Magnetism, 
Annual Presidential Address, 1905, G. W. Littlehales. 327 
