will take place amongst them before that period has elapsed. I have not noticed the differences in the annual deaths in this method of calculation, which are happily small, comparatively speaking, not more, as Mr. Milne observes, than 10 per cent.; and even that difference is, in all probability, principally occasioned by variations in infant mortality. I must add, that this mode of calculation necessarily cuts off ten of the first years of the preceding table.

(15) I conceive, however, that the intensity in the fecundity of marriages is confined within a term, at least two years shorter than even the last-mentioned one. I have, therefore, added a third table, in which the number of the "teeming females," as Graunt denominates prolific wives, is taken as the sum of the marriages of the eight, instead of the ten preceding years, assuming therefore nine years to be the average term of matrimonial prolificness.

TABLE

SHEWING, FROM THE REGISTERS OF ENGLAND, THE EFFECT

Conceptions

(16) Supposing the marriages of the eight preceding years only are taken, on the average, as expressing the number of the fecund ones in existence; and, rejecting the marriages of the current year, with threefourths of a conception for each, then the following table will express the annual fecundity of marriages as follows:

TABLE XXXIX.

SHEWING, BY another Method, from the Registers of England, THE EFFECT of ScarcitieS ON THE PROLIFICNESS OF MARRIAGES.

(17) These last tables present precisely the same result as the first one, namely, the greater fecundity of dear than cheap years; and, moreover, the general