TABLE 14 

 Whole brain: Average percentage increase per day 



Whole brain 



Water 



Solids 



Phosphatids 



Cerebrosides 



Sulphatids 



Cholesterol 



Total lipins 



Proteins 



Organic extractives. . 

 Inorganic extractives 

 Total extractives 



8-MONTH 



0.028 



0.04 



0.046 



0.03 



0.057 



0.072 



0.02 



0.03 



0.02 



0.00 



0.00 



0.00 



These data were estimated from curves similar to, but larger than curves (1). 

 These were plotted from data in table 10. 



In the calculation from the curves a period of one-half month before and one- 

 half month after each age was used. It is believed that the enormous figures 

 for rate of growth sometimes presented for early fetal life are due to the method 

 of calculating from the weight at the beginning of the period. When the growth 

 rate is changing rapidly, the error in such calculations is very large. 



The curves in graph 3, excepting extractives (c), are plotted from this table, 



TABLE 15 

 Whole brain: Average percentage increase per day 



8 MONTH- 

 21 YEARS 



Whole brain 



Water 



Solids 



Phosphatids 



Cerebrosides 



Sulphatids 



Cholesterol 



Total lipins 



Proteins 



Organic extractives. . . 

 Inorganic extractives. 

 Total extractives 



0.013 



0.014 



0.01 



0.012 



0.016 



0.018 



0.018 



0.014 



0.007 



0.0 



0.0 



0.0 



Calculated from data in table 11. The average number of milligrams added 

 per day was divided by the average weight for the given period, instead of the 

 weight at the beginning of the period, as is usually done. When there are rapid 

 changes in weight, this method is not as accurate as that used in table 12. It 

 is believed that the temporary rise in growth at about the seventh month of 

 fetal life is due to the method of calculation. 



The curve marked extractives (c) in graph 3 was plotted from the above 

 data. 



486 



