254 PHILOSOPHICAL TRANSACTIONS. LaNNO]738. 



and West Friezland; these he makes at this time, viz. 1738, to amount in all 

 to 980,000, and gives the following table of the particulars. It exhibits the 

 number of people of all ages, living at the same time, from the birth to ex- 

 treme old age; which, because it shows the chances of mortality within the 

 ages mentioned, he calls the table of contingency of life and death. 



The Table of Contingency. 



Of above QO years old there are 500 



of QO to 86 inclusive 2,500 



85 81 6,500 



Of 



80.. 

 75.. 

 70.. 

 65.. 

 6o. . 



55. . 

 50, . 

 45. . 

 40.. 

 35.. 

 30.. 



.76 13,000 



.71 20,300 



.Q6 27,300 



.61 34,300 



.56 40,8O0 



.51 47,000 



.46 53,000 



.41 57,800 



.36 62,500 



.31 67,600 



.27 58,400 



26 

 20. 

 15. 

 JO. 

 5. 



to 



21 94,300 



16 83,400 



11 87,200 



6 91,800 



birth 131,800 



sum under 27 years 

 ditto above 27 years 



,488,500 

 ,491,500 



sum of all the inhabitants980,000 



sum above 27 years 491,500 



This table is founded on three principles, viz. correct observations on the 

 tables of assignable annuities in Holland, which have been kept there for above 

 125 years; in which the ages of the persons dying are truly entered; on a sup- 

 position that there are yearly born in the two provinces 28,000 living children; 

 and lastly, that the whole number of inhabitants in any country, is to the 

 number of the births, as 35 to 1. 



From this table it appears, 1. That about half the number of people in the 

 two provinces are above 27 years old, and consequently that near the other half 

 are under that age. 2. Then, by following what has been observed for more 

 than 100 years in England, and particularly in London, out of 35 children 

 born, 18 of them are boys, and 17 girls, the people in these two provinces will 

 consist of 504,000 males, 476,000 females. 



He further remarks, that it appears from the assignable annuities for lives 

 beforementioned, the females have in all accidents of age lived about 3 or 4 

 years longer than the same number of males; which he thinks appointed as a 

 compensation for the continual excess there is in the birth of the males above 

 the females. 



