The technique used to reveal the circulation patterns was developed by Hagerty, and depends on the striae which appear in glycerine and glycerine-water mixtures when sheared.Instantaneous flash photographs were taken of circulation patterns in drops of glycerine falling slowly (about 1 cm/sec) in castor oil, and in drops of various glycerine-water mixtures falling at about 10 cm/sec in heavy white oil (viscosity 0.37 poise at 15°C) In the former case the drops were spherical and the circulation pattern agreed reasonably well with that predicted theoretically by Hadamard, in the latter case the drops were no longer spherical and the centre of circulation was displaced below the equatorial plane