Problems connected with the effects of reconstruction have been considered. Case material is presented wherein the reconstruction was followed by an aggravation of symptoms and by recall of an episode, in one sense derivative of the original traumatic event, in another sense serving as a screen function. The hypothesis is, therefore, proposed that the associative connection between constructions and recollections of derivative screen material results from the fact that the reconstruction offered by the analyst serves as a command to remember, following the mechanisms described by Fenichel on the inner injunction to remember.

The reconstruction, when it has the double effect described, then permits, by its approximate accuracy, unconscious material to reach consciousness, but via derivatives which serve as a screen. The