XII. 
Tables exhibiting the Number of White Persons in the United 
States, at every Age, deduced from the last Census. 
BY J. INGERSOLL BOWDITCH. 
Communicated by the President of the Academy. 
Taste I. This table exhibits the number of white persons 
in the United States, in classes, as given by the last census. 
Taste II. The object of this table is to show the number 
of white persons living, at every age, in the United States. 
It is deduced from Table I, by interpolation for every 10 years 
from 20 to 100. Below 20 years the numbers are irregular, and 
we have therefore used the total number from birth to 19 years, 
without reference to the four classes into which it is divided. 
This irregularity renders it impossible to form a_ satisfactory 
table for these years; but if the present method of enumera- 
tion be continued with more minuteness in the ages below 20 
years, we shall probably acquire sufficient data to form more ac- 
curate Tables of Mortality for this country, than any now extant. 
From this table the expectation of life might be ascertained, 
provided the number of inhabitants did not vary ; but it has been 
found from the enumerations made within 40 years, that there 
has been an annual increase of about three per cent. If we 
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