INDEX. 
565 
Page 
Harkness, W.: Flexure of telescope tubes... 512 
— Oblique aberration of achromatic tele¬ 
scopes . 524 
Hazen, H. A.: Auroras and sun spots..... 538 
— Mechanism of a tornado.... 525 
— Scientific ballooning. 510 
— Ten miles above the earth. 532 
Hedrick, J. T., elected member. 534 
Height of the Aurora Borealis. C. Abbe. 522 
Hilgard, J. E., Obituary notice of, by O. H. 
Tittmann... 462, 511 
Hill, R. T.: Geologic evolution of the topog¬ 
raphy of Texas. 508 
— Occurrence of iron in Mexico. 513 
Holmes, W. H.: Traces of glacial man in 
the Trenton gravels. 521 
Hubbard, G. G.: The history of the educa¬ 
tion of the deaf. 505 
Hoyt, J. W.: Letter regarding National Uni¬ 
versity. 539 
Tddings, J. P.: Geology of Crazy mountains.. 512 
— Origin of igneous rocks. 89, 510 
— Study of a dissected volcano. 507 
Isoclinics, The earliest, and observations of 
magnetic force. L. A. Bauer. 397, 539 
Isostatic pressure, Illustrations of. W J 
McGee. 507 
Jenkins, T. A., Death of.'.. 524 
Johnson, A. B.: The cruise of the “ Clover; ” 
further observations of the aberrations 
of the audibility of fog signals. 525, 533 
Joint Commission, Delegates to. 533 
Keith, A.: Geology of Chilhowee mountain, 
Tennessee. 71, 510 
Knowlton,F.H.: Obituary notice of C.C. Parry 511 
Knox, J. J., Death of. 505 
Kummell, C. H.: The direct synthetical 
method of adjusting a triangulation. 535 
— Symmetries of the cubic, and methods of 
treating the irreducible case. 545, 546 
Langley, S. P.: Obituary notice of General 
M. C. Meigs. 471, 506 
— Recent observations of the infra-red 
spectrum. 524 
Latitude-variation tide, Method employed 
to find the. A. S. Christie .. 510 
Lavas of Mount Ingalls. H. W. Turner. 512 
Least square adjustments. M. H. Doolittle.. 546 
-problems, A proposed machine for the 
computation of. G. K. Gilbert. 534 
-A machine for mechanically analyz¬ 
ing Fourier’s “ visibility ” curve, and its 
application to the solution of. F. L. O. 
Wadsworth. 535 
Least squares, The general problem of, and 
a solution of one of the higher special 
cases. R. S. Woodward. 545 
Page 
Le Conte, Joseph : The relation of philoso¬ 
phy to psychology and physiology ... 19, 505 
Lindgren, W.: Silver deposits of Lake val¬ 
ley, New Mexico... 507 
— Two Neocene rivers of California. 521 
Littlehales, G. W.: The efficiency of oil for 
lessening the violence of breaking 
waves. 535 
MeCammon, J. K.: Obituary notice of Asa 
Owen Aldis. 433, 511, 537 
McCormick, J. H., elected member. 522 
McDonald, Marshall: A study of the Gulf 
Stream in relation to the tile fish. 521 
McGee, W J: Classification—chiefly geolog¬ 
ical. 524 
— Gulf of Mexico as a measure of isos- 
tacy. 504 
— Illustrations of isostatic pressure. 507 
Macfarlane, A.: The fundamental principles 
of exact analysis. 535 
Magnetic force, terrestrial, The earliest iso¬ 
clinics and the earliest observations of. 
L. A. Bauer. 397, 539 
Mallery, Garrick, Death of. 538 
— Obituary notice of, by Robert Fletcher.... 466 
Mann, B. P.: An attempted solution of a 
social problem. 506 
Maps, Relief. M. Baker. 349, 533 
Mars, The planet. Asaph Hall. 521 
Marvin, C. F.: An automatic mercurial baro¬ 
graph. 534 
Marvin, J. B.- Obituary notice of George 
Bancroft. 442, 511 
Mason, O. T.: The philosophy of folk-lore... 521 
Mason, V. L.: Modern munitions and en¬ 
gines of war in the United States artil¬ 
lery service. 538 
Mathematical Section, Officers for 1892. 545 
Measurements of the growth of plants with 
an auxanometer. C. Abbe. 522 
Mechanism of a tornado. H. A. Hazen.... 525 
Meigs, M. C., Death of.. 503 
— Obituary notice of, by S. P. Langley.....471, 506 
Mendenhall, T, C.: Electrical congress oi: 
1893, and its work in defining units. 525 
— Gravitation work. 537 
— The uncertainty of conclusions. Presi¬ 
dent’s address for 1892.1, 504 
— Use of planes and knife edges in pendu¬ 
lums . 520 
Merriam, C H.: The temperature control of 
the geographic distribution of plants 
and animals. 537 
Meteorites, The Mexican. J. R. Eastman... 504 
Metre, Method of determination of, in terms 
of a wave length of light. F. L. O. Wads¬ 
worth. 520 
74-Bull Phil. Soe., Wash., Vol. 12. 
