other data that the fall of the birth-rate is differential, and that
the differentiation is largely economic. There are at least two
considerations which must be borne in mind in connection with these
schedules. The first is, that all the marriages described as unlimited
may not have been so. I do not suggest that the answers are
intentionally false, but it is possible that many may have considered
that limitation implied the use of mechanical means; that marriages in
which the parties merely abstained from, _or limited the occasions of_,
sexual intercourse may have frequently entered as of unrestricted
fertility."

The above italics are mine, because, if that surmise be correct, it goes
to prove that the restriction of intercourse to certain periods, which
restriction the married may lawfully practise, is as efficacious in
limiting the size of a family as are those artificial methods of birth
control contrary both to natural and to Christian morality. Dr. Major
Greenwood continues as follows:

"In the second place, the schedules do not provide us with information
as to when limitation was introduced. We are told, for instance, that
the size of the family was five and that its number was limited. This
may mean _either_ that throughout the duration of the marriage
preventive measures were adopted from time to time, _or_ that _after_
five children had been born fertile intercourse was stopped. In the
absence of detailed information on this point it is plainly impossible
to form an accurate judgment as to the effect of limitation."

There are, therefore, no accurate figures to indicate the extent to which
birth control has contributed to the decline in the birth-rate.