Except for a brief discussion of the zero point of the period-luminosity curve and the influence of the absorption of light on its determination, the discussions were mainly confined to the draft report which was approved by the commission. The President read a report from Dr Lampland, which had not been included in the draft report and Prof. Lundmark gave an account of his work on extragalactic nebulae, in particular of the catalogue of about 50,000 nebulae which is now being prepared at Lund.

The President drew special attention to the importance of the problem of the spiral arms for future cosmogonie theories and urged further theoretical investigations on the origin of the spiral structures.