~) aa 
944 G. H. KNIBBS. 
TABLE I. 
Influence of the Rate of Infantile Mortality on the Crude 
Birthrate. 
Country _ Period | Vaslue’ot @enae 
, Birth. Mortality. inB=8,+6p 
New Zealand ...| 1881-1905 | 1882-1906 | 13:2 | +0:191 
Commonwealth... 1887-1905 | 1888-1906 | 16:8 | +0:118 |} 
Sweden... ...| 1881 — 1904 | 1882-1905 | 17-1 | +0-100] 
Norway ...| 1881 - 1905 | 1882 — 1906 | 20°5))) 22ioo 
Prussia .. | F) | ” 19s +0:085 
Various countries 1901 | 1902 19-4 | +0:083 
for one year | 
Netherlands .... 1881—1905 | 1882—1906 | 226 | +0-063 
France ... oe eer 12-7 -| +0-061 
Denmark fee 22:4 | +0:060 
Japan a 1881 — 1904 1882 —1905 | 22:3 | +0053 
Ceylon ... ...| 1881 -1905 | 1882 —1906 | 26-4 | +0042 
Jamaica foe 34:3 | +0-:022 
Switzerland 1881 — 1904 | 1882-1905 | 253 | +0:018 
Treland . 1881 —1905 | 1882-1906 | 25:8 | —0:026 
England & Wales 5s af 28-6 | —0-058 
Scotland eal eet ees 38:9 | —0:068 
The infantile mortality rate (2) is expressed by the number of infants 
dying per 1000 of infants born. 
The crude birthrate (8) is the number of births per 1000 of the total 
population. 
of collateral increase. That the tendency may thus be 
easily masked is however not remarkable, since the influ- 
ence of variations in the rate of mortality is always small. 
The unweighted mean of the above results, and the 
weighted mean, taking the respective populations at the 
middle of the birthrate periods as weights, are:— 
Unweighted Result 8 = 23°73 + 0°0507 p......... (9a) 
Weighted Result (£ = 22°76 + 0°0333 v......... (9b) 
7. There is no reason to suppose that the absolute magni- 
tude of the birthrate is significantly affected by the way 
in which the rate of infantile mortality is associated there- 
with. This is indicated by the fact that its influence upon 
a 
