AT 20 minutes to 6 P.M. on Saturday 10th inst., I witnessed a natural phenomenon which I understand is very unusual. It was a portion of a halo around the zenith. Take the zenith as centre, and with a ...
THE work of von Frisch 1 and others has shown the ability of honeybees to communicate the direction of a food source by indicating the angle between the azimuths (compass direction) of the source of ...
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