330 Mr Harvey on the Increase of' Population 
tire very intimately aljied to each other in the two periods ; the 
rates of increase for the males being respectively 11.5 and 11.2, 
and the females 10.5 and 10.7. There is also a curious relation 
between the third and fourth classes of males for the two pe- 
riods ; the increment of the third class in the former decade be- 
ing nearly double the increment of the same class in the latter 
decade ; and the increment of the fourth class, during the last 
ten years, being also double the corresponding class of the for- 
mer period. The small increments of the males and females of 
10 and under 16, when compared with the other increments, 
afford a contrast somewhat remarkable. Pennsylvania is like- 
wise distinguished for the close approximation of the increments 
of the first classes of its males and females, and so also are Maine, 
Massachusets, Connecticut, New Jersey, Ohio, Georgia, Loui- 
siana, Tenessee, Kentucky, and Alabama. These coincidences 
are, however, better exhibited in a Table. 
States and Territories. 
Increments 
of the Males 
under 10. 
Increments of 
the Females 
under 10. 
Differences. 
Maine, - 
+ 19.2 
4- 18.9 
4 0.3 
Massachusets, 
4 2.9 
4 3.6 
— 0.9 
Connecticut, 
— 2.6 
— 1.8 
4 0.8 
New Jersey, 
4 11.2 
4 10.7 
4- 0.5 
Pennsylvania, 
4 26.6 
4 26.5 
-1- 0.1 
Ohio, - 
4 139.5 
4 139.9 
— 0.4 
Georgia, ... 
+ 26.6 
+ 26.2 
4 0,4 
Louisiana, 
4 243.7 
4 244.3 
4 0.4 
Tennessee, 
4 52.3 
4 51.7 
4 0.6 
Kentucky, - 
+ 27.5 
4 27.7 
— 0.2 
Alabama, . 
4 192.5 
+ 193.6 
— 1.1 
The column of differences exhibits the close approximation of the 
male and female increments to each other; the positive signs 
showing that the excess is on the side of the males, and the ne- 
gative signs that it is on that of the females. In no case is the 
difference greater than 1.1; and in by far the greater number 
of cases it is less than 0.5. The positive differences amount to 
-f- 3.1, and the negative to - — 2.6, the difference between the two 
aggregates being only -f- 0.5 — a coincidence as singular and re- 
markable as any before observed. And when we consider the 
diversity which reigns among the increments themselves, and 
connect with them the uncertain' nature of the causes which have 
contributed to the growth of the population in the respective 
