Wilson. — In the report of the working-group of Sub-Commission 9 b, several recommendations are made. On page 23 of their report the working group recommends that :
1. scales be specified for the various quantities to be measured;
2. equipment suitable for field work be developed and construction standards for this equipment be specified;
3. scales be correlated whenever one and the same quantity may be measured by different methods,
and finally, the recommendation was made that a Symposium be held, in order to discuss and act on these recommendations.