PHYSIOLOGICAL NEEDS VS. SUPPLY. 



123 



investigators, these including Pfeiffer, 1 V. and J. Adriance, 2 Camerer 

 and Soldner, 3 Czerny and Keller, 4 and Langstein, Rott and Edelstein. 5 

 Bailey and Murlin 6 also report the results of analyses made by Gep- 

 hart. The values reported by Czerny and Keller are given in table 22 

 and those of Gephart in table 23. The energy values per liter of human 

 milk as reported by Langstein, Rott, and Edelstein for the first 7 days 

 after birth are as follows : 



First day 1 . 500 calories per c.c. 



Second day 1 . 100 



Third day 800 



Fourth day 750 



Fifth day 700 



Sixth day 675 



Seventh day 650 



TABLE 22. Variations in percentage composition of woman's milk (Czerny and Keller}. 



Nitrogen times 6.25. 

 TABLE 23. Results of analysis of colostrum (Gephart). 



The amount of human milk secreted by healthy mothers depends 

 upon the demands of the infants, thus varying with the weight and 

 strength of the child. That it also varies in primiparse and multipart 



Pfeiffer, Jahrb. f. Kinderheilk., 1883, 20, p. 365. 

 *V. and J. Adriance, Archives of Pediatrics, 1897, 14, p. 22. 

 'Camerer and Soldner, Zeitschr. f. Biol., 1898, 36, p. 277. 



4 Czerny and Keller, Des Kindes Ernahrung, Ernahrungsstorungen und Ernahrungstherapie, 

 Leipsic and Vienna, 1906, p. 412-417. 



'Langstein, Rott and Edelstein, Festschrift z. Heubner, Berlin, 1913, p. 405. 

 Bailey and Murlin, Am. Journ. of Obstetrics, 1915, 71, p. 526. 



