514 Miscellanea 
The single year means are given in Table HI. 
TABLE III. 
Mean Age in Days of Individuals dying under 1 in the Designated Years. 
{The death-rate for the same group is given in brackets heloiv each mean 
age value.) 
$ 
? 
Year 
Legitimate 
Illegitimate 
Legitimate 
Illegitimate 
1882 
1883 
1884 
1885 
1886 
1889 
1890 
1891 
1894 
1895 
1896 
111- 71 
(202-57) 
(204-94) 
114-07 
(205-96) 
113- 91 
(197-55) 
117-15 
(217-29) 
112- 97 
(200-00) 
114- 62 
(204-92) 
110- 96 
(196-55) 
113- 61 
(190-80) 
111- 89 
(207-18) 
111-67 
(187-62) 
96-39 
(341-90) 
100 -04 
(356-52) 
98-86 
(360-83) 
98-15 
(341-24) 
101-79 
(377-47) 
98-00 
(363-40) 
100-53 
(360-65) 
96-37 
(356-66) 
98-15 
(339-52) 
98-58 
(376-59) 
95-85 
(328-69) 
117-89 
(173-02) 
117- 72 
(175-92) 
119-70 
(178-13) 
119-34 
(169-97) 
121- 46 
(188-98) 
118- 28 
(172-90) 
122- 99 
(177-27) 
116-26 
(166-29) 
119- 23 
(163-65; 
116-89 
(175-36) 
116-83 
(159-29) 
104-17 
(314-21) 
103-80 
(322-44) 
103- 09 
(322-02) 
106-26 
(311-06) 
108- 91 
(343-06) 
104- 72 
(330-00) 
109- 05 
(324-83) 
102-54 
(321-75) 
104-16 
(304-46) 
104-07 
(337-16) 
101-79 
(296-99) 
{d) The mean duratimi of life i« uniformly greater in the females than in the males. The 
real basis for the difference is not clear. It can hardly be due to differing conditions of "nurture" 
because there is apparently no reason to suppose that in the long run the environment of a male 
infant differs in any marked and constant way from that of a female infant during the first year 
after birth. Along with the lowering of the mean ago at death in the male there is a 
smaller amount of variation in this character. 
We UKiy turn now to the practical question as to where the first year mortality shall be 
centred. The values of the mean for the different groups range between 3 and 4 months and 
each may be taken as the centering point of its own group. It is desirable, however, to have a 
single value for the total first year mortality, when males and females, and legitimates and 
illegitimates are grouped together. In order to obtain such a value resort was had to the plan of 
a weighted average of all the individual ^'alues. Several schemes of weighting were tried, but as 
all gave very closely accordant results, and the one to be described seemed the most logical, it 
alone need be detailed here. Examination of all the available data indicated that the absolute 
number of deaths of males under 1 stood in about the ratio of 1-25 : 1 to the absolute number of 
