The Act for taking the Census of England required that the 31,000 Enumerators employed should copy into as many books the householders' schedules and other particulars collected by them in their several districts. These books were to be placed, with the schedules, in the hands of the 2,197 Registrars, who were to subject them to a strict examination, and make all necessary corrections. This being accomplished, the books and other documents were to be transferred before the 30th April to the custody of the 631 Superintendent Registrars, who were required to test the accuracy of their contents by a further process of revision.

The rule which was given by Thomas Simpson for finding the value of an annuity on three lives is as follows:—let A, B, and C be the three lives, and let K be a single life, the annuity on which is equal to an annuity on the joint lives of B and C; then the value of an annuity on the joint lives of A and K is the required annuity on the joint lives of A, B, and C. The life A should be the youngest of the three.