132 



GROWTH 



species. As an example, some observations by Scammon on hu- 

 man growth will be cited. In the next chart (Figure 75) curves 

 are drawn to represent the percentage growth of the human 

 body and viscera during the prenatal and postnatal periods. The 

 horizontal base line (abscissa) indicates the age, and the verti- 



PQ3TMATAL DcVCLOPMCNTAL PERIOD 



Percentage: Growth 



in Weight or the: Body and Mscera 



in Prenatal and FbsmATALLirE 



. £ 4 6 10 It 14 16 18 20years 

 (0) (10) <Z0) 00) (40) (50) (60) CTO) (BO) &O)fl0d%) 



I £ 3 4 5 & t 6 9 10 lelal monlha 

 (0) 00) (20) (30) (40) (50) (60) (70) (50) (90)(I00°/J 



Figure 73. Graph showing relative (percentage) growth in weight of the human body 

 and viscera during fetal and postnatal life. The horizontal base line (abscissa) indi- 

 cates age; vertical distance (ordinate) indicates the percentage of the weight at the 

 end of the period, prenatal or postnatal, which has been reached at the corresponding 

 age. Unpublished graph by R. E. Scammon. 



