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1.
S₁: In the eighteenth century people expected most of their children to die before they were grown up.
S₆: There is no obvious limit to the improvement of health that cail be brought about by medicine.

P: Improvement began at the beginning of the nineteenth century, chiefly owing to vaccination.
Q: The general death rate in 1948 (10.8) was the lowest ever recorded upto that date.
R: In 1920 the infant mortality in England and Wales was 80 per thousand, in 1948 it was 34 per thousand.
S: It has continued ever since and is still continuing.