to determine the kind of infection thest sawsd the The boiling of the fish head made it posaible release the skull and visceral skeleton; most of the cartilaginous parts were destroyed, however. None of the gill rakers and the fifth epibranchial, for example, could be kept intact. The fishes which were decapitated without anaes- thesia had less blood in their blood vessels than those which were anaesthetized before decapitation. The blood vessels of the latter could, therefore, be traced more easily than those of the former. No difference could be observed between weakly and strongly anaesthetized individuals The fixative seemed to have the same ability to penetrate heads with or without gill covers. This may