OCTOBER 22, 1897.] 
Professor Ormond Stone (Director of the Lean- 
der McCormick Observatory, University of 
Virginia), on the Great Nebula of Orion. 
2:15 p.m. Address on the Yerkes Observatory 
by Professor George EH. Hale, Director. 
3:00 p.m. Professor Hale and Mr. Ellerman 
will show various solar phenomena with the 
40-inch Yerkes telescope, including the chro- 
mosphere and prominences, the reversal of 
the H and K lines in prominences and 
faculze, the duplication of the D, line, ete. 
Experimental demonstrations will be given in 
the Observatory laboratories as follows: 
Experiments with the rotating arc, Professor 
Crew. 
Analysis of electric radiation by means of the 
interferometer, Professor Hull. 
The effect of pressure on wave-length, Dr. 
Humphreys. 
Measurements of wave-lengths in the infra-red 
spectrum, Assistant Professor Wadsworth. 
Demonstrations in the Optical Shop, and in 
the Instrument Shop. 
7:30 p.m. Professor |Barnard will show with 
the 40-inch Yerkes telescope : 
NV. G. C. 224 (Andromeda Nebula). 
IN. G. C. 598. 
NV. G. C. 1976 (Orion Nebula). 
NV. G. C. 2245 (cometary nebula). 
IV. G. C. 2392 (planetary nebula). 
NV. G C. 6543 (planetary nebula). 
NV. G. C. 6618 (Swan nebula). 
NN. G. C. 6720 (annular nebula). 
NV. G.-C. 7009 (‘ Saturn’ nebula). 
IV. G. C. 7078 (globular cluster). 
R. Leporis (Hind’s crimson star). 
Selected variable stars. 
The 12-inch refractor and 24-inch reflector 
will be used for miscellaneous observations. 
OCTOBER 20, WEDNESDAY. 
Professor George C. Comstock (Director of the 
Washburn Observatory, University of Wis- 
consin), on Determination of Stellar Paral- 
Jax, and on Investigations of the Lunar 
Atmosphere. 
Professor C. L. Doolittle( Director of the Flower 
Observatoy, University of Pennsylvania), on 
the Latitude Work of the Flower Observa- 
tory. 
Father Hedrick (akin ononien Georgetown Col- 
lege Observatory ), on the Photochronograph. 
Professor H. S. Pritchett (Director of the Ob- 
servatory, Washington University, ) on Per- 
sonal Equation in Longitude Determination. 
Dr. Charles L. Poor (Associate Professor of As- 
tronomy, Johns Hopkins University), on 
SCLENOE. 
625 
a New Form of Mirror for Reflecting Tele- 
scopes. 
Professor J. K. Rees (Director of the Columbia 
University Observatory), on the Variation 
of Latitude and the Reduction of the Ruth- 
erfurd Photographs. 
Assistant Professor F. L. O. sahara on a 
Photographic Meridian Circle. 
Professor E. E. Barnard (Astronomer, Yerkes 
Observatory ), on Astronomical Photography. 
Father Hagen (Director of the Georgetown 
College Observatory), on An Atlas of Vari- 
able Stars. 
Professor G. W. Hough (Director of the Dear- 
born Observatory, Northwestern University ), 
on Jovian Phenomena. 
Professor G. W. Myers (Director of the Ob- 
servatory, University of Illinois), on the 
System of 3 Lyree. 
Professor Simon Newcomb, on a subject to be 
announced later. 
Professor E. C. Pickering (Director of the 
Harvard College Observatory), on the Work 
of the Harvard College Observatory. 
7:30 p.m. Professor Hale will show the spectra 
of the following objects with the 40-inch 
Yerkes telescope : 
N. G. C. 1976 (Orion Nebula). a Lyre. 
IN: G:C. 7027: a@ Tauri. 
Aleyone. q@ Orionis. 
DM. 30° 3639. 
OCTOBER 21, THURSDAY. 
8:30 a. m. Departate: from Chicago, of the special 
train. 
9:30a.m. Final session of conferences. 
Dr. Kurt Laves (the University of Chicago), 
on the Teaching of Theoretical Astronomy in 
America, and on Jacobi’s Investigations in 
Theoretical Astronomy. 
11:30 a. m. Formal Presentation and Acceptance 
of the Yerkes Observatory. 
1. Address: ‘The Importance of Astro- 
physical Research and the Relation of As- 
trophysics to other Physical Scierces.’ 
Professor James EH. Keeler, Se. D., Director 
of the Allegheny Observatory. 
2. Presentation. Mr. Charles T. Yerkes. 
3. Acceptance on behalf of the Trustees. 
The President of the Board of Trustees. - 
4, Acceptance on behalf of the University. 
The President of the University. 
5. Prayer. Charles Kendall Adams, Presi- 
dent of the University of Wisconsin. 
1:00 p.m. Luncheon. 
2:00 to 3:30 p.m. Inspection of the Yerkes Ob- 
servatory. 
