614 
PHILOSOPHICAL SOCIETY OF WASHINGTON. 
Page. 
Hallock, W.: Chemical action between 
solids. 518, 542 
— Coefficient of expansion of some rocks. 556 
— Deep well at Wheeling. 571 
— Flow of solids.. 509 
— Formation of alloys . 505 
Hampson, T., Death of. 515 
— Obituary notice of, by H. W. Henshaw.474 
Harkness, W.: Determination of the mass 
of the moon from the tides. 555 
— Obituary notice of E. B. Elliott. 470 
— Solar parallax and related constants. 518 
Harrington, M. W., elected member. 571 
Harris, A. W., elected member... 554 
Harris, R. A., elected member. 566 
Hayden, E.: Hurricanes in the bay of North 
America.. 173, 542 
Hayden, F. V., Death of.. 499 
— Obituary notice of, by A. C. Peale. . 476 
Hayes, C. W., elected member. 530 
Hayford, J. F., elected member. 543 
— Check on the relation between the metric 
units of length and mass. 572 
— Detection by azimuth observations of va¬ 
riations in the pole or vertical. 572 
— Modification of the Ferrel tide-predicting 
machine .. 608 
Hazen, H. A.: Brocken spectre. 550 
— Failure in the application of the law of 
probabilities... 581 
— Influence of forests upon rainfall. 521 
— Lawrence tornado, July 26,1890 . 564 
— Recent Mount Vernon, Ill., tornado.■. 517 
— Two balloon voyages. 511 
Heat, Special laws of the diffusion of, in 
homogeneous spheres. R. S.Woodward.. 607 
Henshaw, H. W.: Obituary notice of Thomas 
Hampson. 474 
Hilgard, J. E., Death of. 568 
Hill, G. W.: Application of infinite deter¬ 
minants to the integration of differen¬ 
tial equations. 601 
— Combination of observations into normal 
positions. 605 
— Interior constitution of the earth as re¬ 
spects density. 581 
— Mass of Titan. 598 
— Reported occultation of o Tauri by Saturn 
in 1679 . i . 606 
— Secular perturbations of two planets mov¬ 
ing in the same plane, with application 
to Jupiter and Saturn. 608 
Hill, R. T.: Neozoic formations in Arkansas. 501 
— Occurrence and availability of under¬ 
ground water in Texas and New Mexico. 571 
— Recent geographical and geological ex¬ 
plorations in the southwest. 569 
Page. 
Hitchcock, R.: Action of light on silver 
chloride. 542 
— Burial mounds of Japan. 553 
— Notes on eclipse-photography in Japan.... 502 
Hollerith, H., elected member. 555 
— Electrical tabulating machine. 553 
Howard, L. O., elected member... 518 
Hoyt, J. W.: Account of the present status 
and prospects of the project for a national 
university... 570 
Hubbard, G. G.: Stanley’s discoveries in 
Africa. 551 
Hurricane, Work of the life-saving crews 
during the recent. F. Baker. 542 
Hurricanes in the bay of North America. 
E. Hayden. 173, 542 
Hyperion, Orbit of. O. Stone. 598 
Hypnotic experiments of the Comte de Mari- 
court. M. M. Snell. 518 
Hypnotism, Experiments in. W. A. Croffut 
and G. Stanley Hall... 516 
Hypsometry, Barometric example of work 
in. G. Thompson. 556 
Ice-arch formed by horizontal pressure. J. 
Murdoch. 507 
Iddings, J. P.: Crystallization of igneous 
rocks. 65, 541 
— Mineral composition and geological oc¬ 
currence of certain igneous rocks in the 
Yellowstone National Park. 191, 550 
— Origin of primary quartz in basalt.. 515 
— Spherulitic crystallization in obsidian..445, 568 
Identity, Continued, in its application to the 
solution of equations, and expressing 
functions in highly convergent forms. 
C. H. Kummell. 607 
Indian types of beauty. R. W. Shufeldt. 567 
Industry, Evolution of..... 569 
Iroquois beach. J. W. Spencer.. 500 
Irrigation in the arid region. C. E. Dutton.. 542 
Irving, R. D.: Obituary notice of, by I. C. 
Russell. 478 
James, J. F., elected member. 552 
James, J. N., elected member. 571 
Japan, Burial mounds of. R. Hitchcock. 553 
Jenney, W. P., elected member. 555 
Keith, A., elected member. 506 
— Rocks of the Great Smokies and their age. 540 
Kenaston, C. A.: Physical features of a por¬ 
tion of the British northwest. 507 
Kendall Green, New departure at. J. C. 
Gordon. 571 
Kidder, J. H., Death of.. 533 
— Obituary notice of, by R. Rathbun. 480 
Kttmmell, C. H.: An error of Delaunay. 604 
— Fundamental theorems in mensuration 
in one, two, or three dimensions. 600 
