The Orientation of Ants

Abstract

1. The orientation of ants to gravity has been investigated, and it is shown that orientations symmetrically placed on either side of the vertical are confused. 2. The georeceptor is located in the antenna, and is probably Johnston's organ. Only one antenna is in use at any one time during geo-orientation. 3. The light compass reaction has been investigated and it is shown that orientations Θ° and 180-Θ° are confused. No explanation can be offered for this. 4. The results are discussed in relation to the hypothesis that ants have a taxis mechanism common to all senses. It is suggested that the function of this mechanism is to set up a temporary labile symmetry of the ant with respect to orientatory stimuli.