s of life. The mean of life
varies in different countries from 40 to 45. A generation from father to
son is about 30 years; of men in general five-sixths die before 70, and
fifteen-sixteenths before 80. After 80 it is rather endurance than
enjoyment. The nerves are blunted, the senses fail, the muscles are
rigid, the softer tubes become hard, the memory fails, the brain
ossifies, the affections are buried, and hope ceases. The remaining
one-sixteenth die at 80; except a one-thirty-third, at 90. The remainder
die from inability to live, at or before 100.

About the age of 36 the lean man usually becomes fatter and the fat
man leaner. Again, between the years of 43 and 50 his appetite fails,
his complexion fades, and his tongue is apt to be furred on the least
exertion of body or mind. At this period his muscles become flabby,
his joints weak; his spirits droop, and his sleep is imperfect and
unrefreshing. After suffering under these complaints a year, or
perhaps two, he starts afresh with renewed vigor, and goes on to 61 or
62, when a similar change takes place, but with aggravated symptoms.
When these grand periods have been successively passed, the gravity of
incumbent years is more strongly marked, and he begins to boast of his
age.

In Russia, much more than in any other country, instances of longevity
are numerous, if true. In the report of the Holy Synod, in 1827,
during the year 1825, and only among the Greek religion, 848 men had
reached upward of 100 years of age; 32 had passed their 120th year, 4
from 130 to 135. Out of 606,818 men who died in 1826, 2,765 were above
90; 1,432 above 95, and 848 above 100 years of age. Among this last
number 88 were above 115; 24 more than 120; 7 above 125, and one 130.
Riley asserts that Arabs in the Desert live 200 years.

On the average, men have their first-born at 30 and women at 28.
The greatest number of deliveries take place between 25 and 35. The
greatest number of deliveries take place in the winter months, and in
February, and the smallest in July, i.e., to February, as 4 to 5 in
towns and 3 to 4 in the country. The night births are to the day as 5
to 4.

Human Strength.--In Schulze's experiments on human strength, he found
that men of five feet, weighing 126 lbs., could lift vertically 156
lbs. 8 inches; 217 lbs. 1.2 inches. Others, 6.1 feet, weighing 183
lbs., 156 lbs. 13 inches, and 217 lbs. 6 inches; others 6 feet 3
inches, weighing 158 lbs., 156 lbs. 16 inche