. The biology of death; being a series of lectures delivered at the Lowell Institute in Boston in December 1920. Death (Biology); Death. NATURAL DEATH, PUBLIC HEALTH 237 laissez-faire policy would be better, or that public health efforts have not been enormously valuable in connection with typhoid fever and diphtheria. My purpose is quite other, being solely a desire to emphasize two things, viz: 1. That the trend of human mortality in time is an too 9O SO 70 60 -50 40 30 ^o to DIPHTHERIA. 1898 99 19OO Ol 0^ 03 04 O5 06 O7 08 09 YEAR 10 II 12 Fia. 56. — Like figure 55, but for diphtheria and c
. The biology of death; being a series of lectures delivered at the Lowell Institute in Boston in December 1920. Death (Biology); Death. NATURAL DEATH, PUBLIC HEALTH 237 laissez-faire policy would be better, or that public health efforts have not been enormously valuable in connection with typhoid fever and diphtheria. My purpose is quite other, being solely a desire to emphasize two things, viz: 1. That the trend of human mortality in time is an too 9O SO 70 60 -50 40 30 ^o to DIPHTHERIA. 1898 99 19OO Ol 0^ 03 04 O5 06 O7 08 09 YEAR 10 II 12 Fia. 56. — Like figure 55, but for diphtheria and croup. extraordinarily complex biological phenomenon, in which many factors besides the best efforts of health officials are involved. 2. That for many causes of death a vast lot needs to be added to our knowledge of etiology, in the broadest sense, before really efficient control can be hoped for. This knowledge can come only through scientific investi-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Pearl, Raymond, 1879-1940. Philadelphia, London, J. B. Lippincott Company
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