PLATES XLI-LIII SYNOPSISThe value of employing both light and electron microscopy in cytological research is discussed. It is pointed out, however, that depending upon the kind of problem being studied it may be necessary to employ a wide variety of experimental techniques. This is particularly true when attempting to relate structure to function. To emphasize this, and to present a synthesis of some recent work, observations made by the writer and collaborators on the testes of normal, hadiated and oeatrogen-treated rats are described. The following main results are reported: 1. The residual bodies, cast off by the newly-formed

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