I / Stellar Fluxes.- A. Absolute Calibration.- 1. Absolute intensity calibration methods in the vacuum UV region.- 2. An investigation of the properties of vacuum-ultraviolet radiation detectors (Abstract).- 3. Recent absolute calibration work at Palomar Mountain.- 4. General discussion (On calibration methods).- B. Interstellar Extinction.- 1. Interstellar extinction (Introductory lecture).- 2. Ultraviolet interstellar extinction from a comparison of ? Persei and ? Pesei.- 3. Observations of interstellar extinction in the ultraviolet with the OAO satellite.- 4. On dielectric models of interstellar grains.- 5. Extinction curves for graphite-silicate grain mixtures.- 6. Measurement of interstellar extinction in emission line stars.- 7. The interstellar extinction curve from 4000 Å to 6500 Å.- C. Theoretical Models for Stellar Fluxes.- 1. The effective temperatures of the O stars.- 2. The effect of Silicon and Carbon opacity on ultraviolet stellar spectra.- D. Observed Stellar Fluxes.- 1. Review of ultraviolet and visual continuum observations and comparisons with models.- 2. The stellar temperature scale from 05 to A0.- 3. On ultraviolet fluxes, bolometric corrections and effective temperatures of late B to F stars.- 4. Far-ultraviolet intensities of Orion stars.- 5. Ultraviolet photometry of stars obtained with the Celescope experiment in the Orbiting Astronomical Observatory.- 6. Photographic magnitudes of 201 stars at 2600 Å.- 7. Spectrophotometrie integree des galaxies proches dans l'ultraviolet (expérience Persée).- 8. Low resolution stellar spectrophotometrie observations in the region 1500 Å-3000 Å.- 9. Absolute stellar photometry in the region 1200 Å-3000 Å.- 10. Preliminary note on the astronomical satellite Kosmos 215.- 11. Ultravioletphotometry of stars from OSO II.- 12. The ultraviolet solar opacity.- II / Stellar Line Spectra.- A. Rocket and Satellite Observations of Ultraviolet Spectra.- 1. Observations of ultraviolet stellar spectra.- 2. Photoelectric rocket spectra at 10 Å resolution (Abstract).- 3. Rocket spectroscopy of ? Puppis below 1100 Å.- 4. Observations of strong stellar lines with the OAO.- 5. The far-ultraviolet spectrum of ? Cassiopeiae.- 6. UV spectrophotometry of Canopus from Gemini XI.- B. Ground-Based Observations of Spectra Relevant to the Ultraviolet.- 1. Review of ground-based observations of spectra relevant to the ultraviolet.- 2. Chromospheric activity in red giants, and related phenomena.- 3. Mass loss from early-type stars.- C. Theory Relevant to UV Spectra.- 1. A discussion of the theory for interpreting ultraviolet stellar spectra.- 2. Possibility of fluorescence phenomena in the ultraviolet spectrum of symbiotic stars and long period variables.- 3. Radiative acceleration and ultraviolet resonance line profiles in OB supergiants.- 4. Stellar-wind theory for O and B stars (Abstract).- D. The Sun - a Typical G2V Star.- 1. Review of astrophysical conclusions from the UV solar spectra.- 2. Resonance lines in the solar chromosphere.- 3. On the contribution of solar activity to the ultraviolet spectrum of the Sun.- 4. Intensity distribution in the Lyman-? line at the solar limb.- 5. A high-resolution solar spectrum 2000 Å-2200 Å.- 6. Fabry-Pérot interferograms of the solar MgII resonance lines.- III / Interstellar Absorption and Emission.- A. Absorption Lines.- 1. Observations of interstellar Lyman-? absorption.- 2. Observations of interstellar Lyman-? with the Orbiting Astronomical Observatory.- 3. Interstellar lines other than hydrogen.- 4. Interstellarmolecular hydrogen (Abstract).- 5. General discussion.- B. Emission.- 1. The night sky brightness measured from satellites Kosmos 51 and 213.- 2. Mariner 5 measurements of ultraviolet emission from the Galaxy.- 3. The ultraviolet background (intergalactic gas, the Galaxy, and subcosmic rays).- 4. Lyman-? radiation from nebular objects.- Space and ground-based stellar spectrophotometry: a summary.
