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microscope stage chamber, with special reference to the frequency, depth and length of their contrac- tions. Contractile and non-contractile pieces were dissected and the stage of the cycle was determined histologically. The mean depth of the contractions was 12 \g=m\and their mean frequency was five/min. The mean length of the indentation caused by a single con- traction was 67 \g=m\.There was an average of one contractile area for each 240 \g=m\.length of tubule. Spontaneous contractions were seen to occur at any stage of the cycle. Non-contractile pieces of the tubule were also found independent of the stage of the cycle. The observations are com- patible with the view that the contractions promote the transport of spermatozoa and tubular fluid to the rete testis.

THE RELATION BETWEEN IN VITRO CONTRACTIONS OF THE RAT SEMINIFEROUS TUBULES AND THE CYCLIC STAGE OF THE SEMINIFEROUS EPITHELIUM