4,20 Mr. Lubbock on I he Cfiisiis. 



With these data it is easy to find that the males of the age 

 of 20 now, are to the total number of births now, as 2548 to 

 10,000, and the females of the age of 20 now, are to the total 

 number of births now, as 25,53 to 10,000; hence, if the total 

 number of births annually be to the population as 1 : 31*854; 

 (see p. 4-17, line 17), the number of males aged 20 now, 

 is to the wliole population as 80,000 : 10,000,000 nearly, and 

 the number of females aged 20 now, is to the whole popula- 

 tion as 80,180: 10,000,000 nearly; hence in a population of 

 twenty millions there are about 160,000 couples aged 20. 



If the total number of births annually be to the population 

 as 1 : 24'-660 (see p. 4-17, line 31), the number of males of the 

 age of 20 is to the population as 103,360: 10,000,000; and 

 the number of females of the age of 20 is to the population as 

 103,560: 10,000,000 ; hence in a population of twenty millions 

 there are about 206,720 couples aged 20. According to the 

 census of 1821, p. xv. there are 988 males between 15 and 20 to 

 a population of 10,000 males. Dividing this by 5 we have 197*6; 

 the ratio of males to females in the population is *95754 : 1 . 



Therefore (197*6 x l2^Z^ = 94-6 ) according to these data 



there are about 189,200 couples aged 20 in a population of 

 twenty millions. 



The rate of increase in England has never amounted to 

 l-Oi-, nor do I think it has ever exceeded 1*017; during the 

 greater part of the last century it was about 1 •004'. I have 

 found that the ratio of the deaths to the population is very 

 little affected by the rate of increase of the population ; while 

 the ratio of the births to the population varies very much. If 

 the population increased at the rate of four per cent, annually, 



this ratio would be greater than — , and the number of couples 



aged 20 in the population of 20,000,000 would exceed consi- 

 derably 200,000. 



As the census is now under the consideration of Parliament, 

 it is to be hoped that some means may be devised of obtain- 

 ing more extensive information than has hitherto been given: 

 the bills of mortality ought to be published for the whole em- 

 pire every year ; the ages at which deaths take place being 

 distinguished for at least every five years. This is done, I be- 

 lieve, in almost every other country in Europe but our own, 

 not excepting Russia ; for I have the bill of mortality before 

 me for that empire for the year 1827, including thirty-eight 

 provinces, which are kept distinct, and which present alto- 

 gether a total of more than 600,000 deaths. 



It would be desirable also that the diseases should be stated, 



from 



