SECRETARY'S REPORT 89 
Wuirtney, C. A. Comments on the present status of the pulsation theory. Astron. 
Journ., vol. 62, p. 149, 1958. 
The Ca II emission of classical Cepheids. Mem. Soc. Roy. Sci. Liége, 
ser. 4, vol. 20, 1958. 
Granulation and oscillations of the solar atmosphere. ‘Smithsonian 
Contr. Astrophys., vol. 2, p. 365, 1958. 
WHITNEY, C. A., and Cox, J. P. Stellar pulsation. IV. A semitheoretical period- 
luminosity relation for classical Cepheids. Astrophys. Journ., vol. 127, p. 
561, 1958. 
WuHirney, C. A., and Stone, P. Numerical integration for nonadiabatic com- 
pression waves in the solar atmosphere. Astron. Journ., vol. 62, p. 149, 1957. 
Wrient, F. W.; Jaccuia, L. G.; and Wurepte, F. L. Photographie (-Aquarid 
meteors and evidence for the northern Aquarids. Astron. Journ., vol. 62, p. 
225, 1957. 
OTHER ACTIVITIES 
Various members of the staff attended meetings and presented 
papers before the American Astronomical Society, the American Phys- 
ical Society, the American Geophysical Union, the National Tele- 
metering Conference, the American Institute of Mining and Metallur- 
gical Engineers Conference, and the American Meteorological Society. 
Every member of the scientific staff has given lectures before schools, 
colleges, civic groups, and military organizations, on the subjects of 
satellites and space. Some have taken part in round-table discussions 
on television and radio. 
For the annual meeting of the Regents of the Smithsonian Insti- 
tution, the Observatory displayed a series of models illustrating the 
Baker-Nunn camera, the Norrman time standard, and the satellite 
tracking station buildings and layout. 
Dr. J. Allen Hynek represented the Astrophysical Observatory at 
the opening ceremonies of the satellite tracking station at Curacao. 
He also took part in two symposia: Space Telescopes, at the Air Tech- 
nical International Center, Wright-Patterson Air Station; High Al- 
titudes, at Bethesda, Md. 
Leon Campbell, Jr., represented the Director at the Eighth Annual 
Congress of the International Astronautical Federation, in Barcelona, 
Spain. 
Dr. Gerhard F. Schilling represented the Smithsonian Institution 
at the Eleventh National Conference on the Administration of Re- 
search, held in Washington, D.C. At a special meeting of the Na- 
tional Academy of Sciences, May 1958, he reported the scientific results 
obtained by the Optical Satellite Tracking Program. 
Dr. John S. Rinehart participated in the Symposium on Properties 
of Materials of the American Institute of Metallurgical, Mechanical, 
and Petroleum Engineers in New York, and the Symposium on Min- 
ing Research at the Missouri School of Mines. He also lectured at 
the Summer Science Institute at Northeast Missouri State Teachers 
College. 
