measures the number of children to 4 years of age relative to the num- 

 ber of women 15 to 44 years old. This increased for all counties and with 

 the exception of Coos County was due to a greater number of children. In 

 Coos County a decline in the number of women of child-bearing age from 

 migration was greater than the increase in children. 



Changes in Sex Ratios 



There was a decline in the number of males relative to the number 

 of females in all counties but Grafton. This exception is probably due to 

 the inclusion of Dartmouth College students in the census count. In all 

 counties but one the decline in sex ratio was due more to migration than 

 to natural causes. 



These are the major finding. They point to shifts in the age and sex 

 structure of the population in the counties of New Hampshire as a result of 

 migration. The methodology followed and the kind of observations which 

 have resulted should provide useful guides to those interested and con- 

 cerned with changes in the population and in the meaning of these changes 

 to services, institutions, taxes, and markets. 



16 



