The proportions are essential in order to make comparison between one area and another possible; and comparison is the sweet savour of survey.

We cannot compare the work of three men labouring among an unstated population with the work of two other men working in an unstated population; the moment that the proportions are worked out the cases can be compared.

But some men detest this purely quantitative comparison.

They insist, and rightly, that there is no true equality in the comparison.

One man differs from another man and his work differs from the work of the other man: over large areas it is often the work of one man among many which really saves the situation.