For such a station, therefore, we design our first survey, the object of the survey being to discover how far the work of the station is succeeding in performing the task which it obviously undertook when it accepted the definition of area.
1.

We begin then by surveying the position of the work in the station district extensively: we ask--What is the relation between the work done and the work remaining to be done?
We ask this question in two forms; first, in terms of the cities, towns, and villages which lie in the station area, and secondly, in terms of population.

We ask the question in this double form because we believe that by this means the surveyor will obtain a clear view of the situation and will be able easily to see what has been done in relation to the work yet to be done, and it is the relation of those two that is most illuminating.

If these tables were constantly revised the progress of the work could be traced from year to year easily and helpfully.

Put side by side they illuminate each other, and each affords a check upon the other.