The publication of all the papers along with the invited contributions to the discussions of these, read at recent Congresses, has given rise to major difficulties. Often some papers had been promised to other journals, and apart from that, the mass of material could not be accommodated within the Journal. To get a complete presentation of the 25th International Congress, the Publications Committee of the British Institute of Psycho-Analysis, which is responsible for the International Journal of Psycho-Analysis, agreed a policy with the Programme Committee of the Congress. According to this agreement the Programme Committee selected the papers and decided the maximum length for all contributions. It then arranged for Dr J. H. Thiel, assisted by Dr N. Treurniet, of the Dutch Psycho-Analytical Society, to collate the material. The Editors of the Journal are grateful to them for much of the preliminary work involved in preparing this Congress number.