. The biology of death; being a series of lectures delivered at the Lowell Institute in Boston in December 1920. Death (Biology); Death. THE CHANCES OF DEATH 95 into five component frequency curves. The data which he used were furnished by the df line of Ogle's life table, based on the experience of 1871 to 1880 in England. This line gives the deaths per annum of one thousand persons born in the same year. The first component which he sepa- rated was the old age mortality. This is shown by the dotted curve having its modal point between 70 and 75 years, at the point lettered Ol on the base of
. The biology of death; being a series of lectures delivered at the Lowell Institute in Boston in December 1920. Death (Biology); Death. THE CHANCES OF DEATH 95 into five component frequency curves. The data which he used were furnished by the df line of Ogle's life table, based on the experience of 1871 to 1880 in England. This line gives the deaths per annum of one thousand persons born in the same year. The first component which he sepa- rated was the old age mortality. This is shown by the dotted curve having its modal point between 70 and 75 years, at the point lettered Ol on the base of the diagram. PEARSON'S GRADUATION OF. IOQ or un; FIG. 25.—Showing Pearson's results in fitting the dx line of the life table with 5 skew frequency curves. Plotted from the data of Pearson's original memoir on "Skew Variation" iu Phil. Trans. Roy. Soc. This component, according to Pearson's graduation, accounted for deaths out of the total of 1,000, or nearly one-half of the whole. Its range extends from under 20 years of age to the upper limit of life, at approx- imately 106 years. The second component includes the deaths of middle life. This is the smooth curve having its modal point between 40 and 45 years at the point on the base marked 02. Its range extends from about 5 years of age to about 65. It accounts for deaths out of the total of 1,000. It is a long, much spread out. 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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