Great students of natural history have also, as a rule, lived long and happy lives.

Of fourteen members of a noted historical society in England, who died in 1870, two were over ninety, five over eighty, and two over seventy.
The occupation of the mind has a great influence upon the health of the body.
There is no employment so dangerous and destructive to life but plenty of human beings can be found to engage in it.

Of all the instances that can be given of recklessness of life, there is none which exceeds that of the workmen employed in what is called dry-pointing--the grinding of needles and of table forks.

The fine steel dust which they breathe brings on a painful disease, of which they are almost sure to die before they are forty.

Yet not only are men tempted by high wages to engage in this employment, but they resist to the utmost all contrivances devised for diminishing the danger, through fear that such things would cause more workmen to offer themselves and thus lower wages.