We also record the comparatively early death of Dr. B. M. Cwilong in London in the beginning of this year. Dr. Cwilong was born in Russia of Polish parents. As a young man he went to the CIarendon Laboratory at Oxford. There, under Professor G. M. B. Dobson, he carried out important general research work on atmospheric ice crystals, while specializing in the physics of condensation nuclei.

Dr. Cwilong was interested in many other aspects of ice and the writer of this note remembers with gratitude the many interesting discussions with him at the Clarendon Laboratory and much helpful advice.

G. Seligman