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r ' * . « * r „ v s . /• ' ’ 
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, III. j Extract by John van Rixtel, F. R. S. of 
Mir. W. Kerfleboom’s * Second and Third 
! Treatife ~ Confirming the Manner how to 
know the probable Quantity of People in 
the ‘Provinces of Holland and Wefl-Frief- 
land, befides a Foundation on which to 
prove the probable Lives of Widows, and 
likewife a Rule whereby to know the ‘Du- 
ration of Marriages. 
Second Part. 
Read Jan 
i74*-3- 
* 7 * 
M 
R. Kerjfeboom having advanced 
in his Firjl Treatife , printed Anno 
1738, that the Provinces of Holland and ITeJl-Frief- 
land contained 980,000 Souls, of all Ages, on a well- 
grounded Suppofition, that annually are born in 
the faid Two Provinces 28000 Children alive; but 
it having been the Opinion, that this fhould be more 
clearly demonftrated, has thought it neceflary to 
comply therewith. In order to which, the Author 
has divided the Provinces into Three general Divi- 
Fons, diftinguifhed with the Letters A , B,C 5 and 
given the Names of the feveral Cities, Towns, and 
Villages, belonging to the feveral Letters juft now 
mentioned 5 and fuppofes, on good Grounds, (though 
not on a Mathematical Enumeration, which the Au- 
* See an Account of the Firft Part, ThiJofophical Travfaftiow, N® 
450. p. 401. 
SC ... t h or 
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