An approximate calculation of the ground‐level high‐energy mu meson intensities is presented, with curves showing peculiar maxima in the angular vicinity from about 55° to 75° with respect to the vertical at ground‐level energies from about 60 bev to 160 bev. The effects are explained in terms of well known pi meson decay‐absorption phenomena high in the earth's atmosphere.

Measurements o f absolute differential muon intensities have been made with the Texas A & M-University o f Houston solid-iron magnetic spectrometer at axis orientations o f 0" 665 and 80". The momentum range covered is from 2 to 300 GeV/c although emphasis has been on the accuracy of measurements from 20 to 50 GeV/c. The large-zenith-angle orientations have allowed measurements o f the intensity over the zenithal range 55'-85". The actual measured intensities are presented along with the final corrected intensities evaluated at standard momenta. These measurements, made with a single instrument, may serve as normalization intensities for large-zenith-angle high-MDM (maximum detectable momentum) spectrometers which cannot be operated at arbitrary axis orientations and for which intensity-normalization points at moderate energies can be useful. The results are shown to be consistent with the most recent measurements from the Kiel-DESY magnetic spectrometer. The procedures for recording and analyzing the data are presented in detail. P . J . G R E E N e t a l .

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Contemporary authors of basic astronomy textbooks introduce the celestial sphere in less than ideal ways. It is suggested that an early discussion of the celestial sphere should make reference to a companion figure showing the Earth-Sun relation with explicit attention to the equinoxes, solstices, and other major features.