40 
Proceedings of the Royal Society of Edinburgh. [Sess. 
The officer in charge entered all results as they were obtained and 
straightway plotted the graphs. A report, based upon his medical history 
and Test Station performance, was made out for each subject and for- 
warded to the C.O. of the Unit concerned. The report stated the physical 
capability of the man and his probable utility when trained. In the 
numerous instances where the tests showed him to be useless as a fighting 
Fig. 9. 
unit, a recommendation was added in regard to the purpose (if any) to 
which he could be put. 
A complete test, as described, took about thirty-five minutes. The 
time taken obviously precluded the use of the method for every recruit, 
and that was never the intention ; the Station was set up to deal with 
special cases. 
IV. Results. 
Specimen charts are reproduced in figs. I to 8. The arrow-heads 
indicate the resting value of the CO 2 proportions. The A curves show 
the relation between load and expired-COg-percentage when breathing 
normal air, and the B curves that when breathing oxygenated air. 
When the Station was in operation men over forty years of age were 
being conscripted, and many of these were examined. Only about 20 
per cent, of them gave evidence of being worth training. The graphs 
