The following table, taken from Farr and Quetelet, gives the probable after lifetime, or duration of life, at different ages, of males and females in England, and also the mean rate :-
 

	Males		Females		Both sexes
Age	Mean	England	Mean	England	Mean	England
0	37	39	43	42	40	45
10	50	47	52	48	51	51
20	41	39	43	40	42	43
30	34	33	35	33	35	35
40	26	26	28	27	27	27
50	18	20	20	21	19	20
60	12	14	13	14	13	13
70	7	8	7	9	7	8
80	3	5	4	5	4	4
90		2.84		3.01
100		1.68		1.76

THE RELATIVE NUMBER 0F THE SEXES.
As regards the relative number of the sexes born, the average for Europe gives 196 boys for every 100 girls. Further , according to researches made both in this country and in Germany, on the influence of the age of parents on male and female births, it is found that, in general, when the mother is older than the father, fewer boys than girls are born. The same is the case where the parents are of equal age; but the more the father's age exceeds that of the mother's, so is the ratio of boys greater.

THE MARCH OF AN ENGLISH GENERATION THROUGH LIFE.
A picture, vivid by its lively representation, of the various illnesses and accidents which befall the average inhabitant of our island, is given by Dr. Farr in the Thirty-fifth Annual Report of the Registrar General of Births, Deaths, and Marriages.

This account of the march of an English generation through life commences by singling out, in imagination, a million children from the moment of birth. 

It will be found that more than a fourth part of the whole number, taking England all over, will have been removed by death before they reach the age of five years. 

Most of the survivors have been attacked by some disease, or by more diseases than one.Yet increasing strength enables them to withstand better the onslaughts of illness, and less than a seventh part of the number of deaths recorded in the first period of five years is enumerated in the second five.

The deaths between the ages of ten and fifteen are fewer than at any time of life. 

At the age of fifteen to twenty the mortality increases again, especially among women; as consumption and childbirth - for a greater proportional number of deaths occur among those who marry at an early age - make sad havoc in their ranks. At this age the more dangerous occupations of men, over those of women, begin to show their influence, and fully eight times as many men as women die violent deaths.

The number of deaths from violent causes increases in the next five years - from twenty to twenty-five - while, during it, nearly half the mortalitty is from consumption.

In the period from twenty-five to thirty-five consumption is again the most fatal disease. 

Between thirty-five and forty-five the same conditions continue in the main. The deaths by consumption still predominate; but the strain of time on the structure of the body has also been great at this age, and many succumb to diseases of the principal organs. The violent deaths at this age continue at much the same quota as at the period when men first begin to enter active life.

The period from forty-five to fifty-five begins with diminished numbers: the million which was surveyed in imagination at the outset has now dwindled down to half that number. The number of deaths at this age is considerably greater than in the preceding decade. Consumption is still very destructive, and diseases of the brain and diseases of the heart show, by the number of their victims, the effect of the combined strain of wear and tear. 

Of the original million 421,115 attain to the age of fifty-five, and from this point of time the degree of danger, which has hitherto increased slowly, now increases at so much faster a pace that, although the number of lives grow less, the number of deaths increases in everyone of the next twenty years, and is afterwards sustained for ten years longer, until at last, in the distance, all sink into the elements from which they came.

Of any hundred women living at the age of fifty-five and upwards, it is worthy of note that 

• eleven are spinsters, 
• forty-three widows, and 
• forty-six wives

• nine are bachelors, 
• twenty-four widowers, and 
• sixty-seven husbands. 

Between fifty-five and sixty-five the diseases of the lungs, heart, and brain are very fatal to life. Among the men violent deaths are as common as at the earlier stages; but suicides are more numerous, the greater number of deaths from that cause, in proportion, Occurring at this age. That the cares and  troubles of life increase, while life and vigour decline, probably accounts for this melancholy fact.

Between sixty-five and seventy-five the deaths are more numerous than in the ten years previous. 
The age of seventy-two is that when the greater number of men die.

From seventy-five to eighty-five the influence of weather upon health becomes more marked.

One would hardly expect to find that, on an average, out of every million born, 

• 161,124 reach the age of seventy-five. 
• 38,565, reach eighty-five 
• about 220 reach the age of a hundred.