An American text-book of physiology . xvii., 1866. REPROD UCTION. 925 Tilt length and the weight at birtli vary very greatly. The average measure-ments, as given for over 450 infants in Great Britain, are, for height, inches, females inches; for weight, males pounds, females, The weight at birth is said to be greater the nearer the mothersage is to thirty-five years, the greater the weight of the mother, the greaterthe number of ])revious pregnancies, and tlic earlier the appearance of the firstmenstruation. Race and climate are also of influence. Minot^ believes
An American text-book of physiology . xvii., 1866. REPROD UCTION. 925 Tilt length and the weight at birtli vary very greatly. The average measure-ments, as given for over 450 infants in Great Britain, are, for height, inches, females inches; for weight, males pounds, females, The weight at birth is said to be greater the nearer the mothersage is to thirty-five years, the greater the weight of the mother, the greaterthe number of ])revious pregnancies, and tlic earlier the appearance of the firstmenstruation. Race and climate are also of influence. Minot^ believes that allof these influences work principally through prolonging or abbreviating theperiod of gestation, and that the variations at birth depend partly upon theduration of gestation and partly upon individual differences of the rate ofgrowth in the uterus. Growi;h of the Body after Birth.—In studying the growth of the bodyafter birth two methods have been employed, named the generalizing and 0 A(je. 5 10 15 20 Years. 25 140 l:iO 100. Fig. 316.—Diagram showing increase of stature and weight of both sexes, as determined by the Anthropo-metric Committee of the British Association. the individualizing methods. The former consists in deducing the courseof growth by averages or other central values from statistics taken from alarge number of individuals at different ages. It is the method more com-monly employed; it shows the of growth of the typical child, but isinexact in enabling future growth to be predicted in individual cases. Theindividualizing method consists in measuring the actual growth of the sameindividual through successive years; it shows well the relation of the indi- C. S. Minot: Human Embryology, 1892.^ Roberts: Manual of Anthropometry, 1878. 926 AN AMERICAN TEXT-BOOK OF PHYSIOLOGY. vicinal to the type throughout the period of growth. The course of growthot British boys and girls from birth up to the age of twenty-four is graphicallyshown in the accompany
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