There was a man in Vienna, aged one hundred and five, who had black hair long after his hair had first become white This man is mentioned as a parallel to Dr.Slave.Similar examples are mentioned in Chapter VI.
It is a remarkable fact that many persons who have reached an old age have lived on the smallest diet and the most frugal fare.

Many of the instances of longevity were in people of Scotch origin who subsisted all their lives on porridges.

Saint Anthony is said to have maintained life to one hundred and five on twelve ounces of bread daily.

In 1792 in the Duchy of Holstein there was an industrious laborer named Stender who died at one hundred and three, his food for the most part of his life having been oatmeal and buttermilk.

Throughout his life he had been particularly free from thirst, drinking little water and no spirits.
Heredity .-- There are some very interesting instances of successive longevity.