He must take count of them.

Therefore if in a district the Protestant and the Roman Catholic cannot survey together, the Protestant who does survey must carefully consider the facts before his face, and endeavour to find out what the facts really are as well as he possibly can.

The facts are that Roman Catholics are working in what he calls "his district"; the facts are that there are churches here, and here, and here, and people who call themselves Christians so many, and that the heathen population is by so many less.

And there are so many mission priests, and they win converts, and the converts won by them cease to be heathen, for they are sometimes persecuted by their heathen neighbours, even as his own converts are persecuted.
Happily all leading surveyors are realising these obvious facts and are now taking these things into serious account; but it is still necessary to insist on their importance.
In these tables, when other missions are at work in the district, all that is necessary is to add one column of the work of the other missions so far as it is known, or can be ascertained.

We are well aware that that easy phrase covers in many cases great practical difficulty.