In view of the wide range of topics covered by the Commission, it was agreed that it would be desirable to press for the nomination of a new president for the Commission each three years.

Report

In a discussion of stellar “temperatures” (§ 2.1) Prof. Russell referred to the importance of “ excitation temperatures “, as determined from the ratio of numbers of atoms in two states of different energy in the atom. Dr Minnaert pointed out that this was essentially only a “ brightness temperature “ to which Prof. Russell agreed, but added that in this way “brightness temperatures” could be found for those stars for which no measures of angular diameter were available.