Certain similarity of' the observed fl ow in the ocean and in the atmospherr to the behavior of' a wake stream, for which a complete, experimentally verified theory is available (1), led Rossby (2) to initiate the extension of the wake stream idea first to a rotating system and secondly, to a stratified medium. Several interesting predictions were made by Rossby as a result of his theoretica l investigation; and it was the purpose of the experiments carried out by the autho1, to in vestigate to what extent these predictions could be verified in the laboratory. The experiments were of an exploratory nature and the conclusions can in no way be rega rded as final.