Mortality statistics of the seventh census of the United States, 1850: Embracing -- I. -- the cause of death, II. -- the age and sex, III. -- the color and condition, IV. -- the nativity, V. -- the season of decease, VI. -- the duration of illness, VII. -- the occupation, of the persons reported to have died in the twelve months preceding the first of June of that year, with sundry comparative and illustrative tables