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Using improved techniques, high‐quality CCD uvbyVI photometry has been obtained for the eclipsing binary HV 982 in the Large Magellanic Cloud (LMC). International Ultraviolet Explorer ultraviolet spectrophotometry was also obtained. These data have been analysed using the Wilson–Devinney synthetic light‐curve code and Kurucz low‐metallicity model atmospheres as well as the EBOP code. The system is detached and the orbit is eccentric. Apsidal motion is detected with apsidal period 205 ± 7 yr. The effective temperatures of the components are found via flux fitting to be Teff,1 = 28 000 ± 5000 K and Teff,2 = 27 200 ± 5000 K. The large errors result from uncertainties over the appropriate interstellar extinction correction. The system plausibly comprises two ∼ 8 M stars of radius 6–7 R separated by ∼ 30 R. For pedagogical and historical interest, the near simultaneity of the eclipse minima at different wavelengths is used to constrain the constancy of the speed of light with wavelength and the mass of the photon, yielding mγ < 10−41 kg. Because of the great distance to HV 982, this limit is some 102 times smaller than previously achieved with eclipse timings, but it is nevertheless 10 orders of magnitude less stringent than that which is provided by satellite measurements of planetary magnetic fields.

Sarcocysts are highly prevalent in the musculature of horses (Equus caballus) in various regions; however, the systematics of Sarcocystis species in equids is confusing. 3 There are 4 reported species of Sarcocystis in equids: S. asinus, S. bertrami, S. equicanis, and S. fayeri. All utilize canids as definitive hosts; however, transplacental infection can occur. 2,4 The interrelationships and validity of the above species are unclear. Pathogenicity of infection is variable, ranging from mild to severe chronic illness in naturally and experimentally infected horses. 5-7 We describe the histologic and ultrastructural appearance of intense Sarcocystis fayeri infection in a malnourished horse. A 3-4-year-old mare was euthanized for humane reasons, having been in deteriorating condition for 2-3 months. At