M. J. KARVONEN 



Figure 1 . The effect of varying 

 pH on the solubility of the 

 haemoglobins of a foetus, 100 

 days old, and on that of its 

 mother. M u : maternal, and 

 F u : foetal Hb, equilibrium ap- 

 proached from the undersatu- 

 rated side, JT/2 = 7*26. M s = 

 maternal, III = 7*99, andF s = 

 foetal, r/2 = 7-39, in both the 

 equilibrium approached from the 

 supersaturated side. 



Figure 2. The solubility of 



five maternal samples of Hb 



atpUA'l. 



+1 



,o> ±0 



-I 



^ 



Figure 3. Tfte solubility of five 

 foetal samples of Hb at pH 7*2. 

 The foetal ages : No. 724 = 74 days, 

 M>. 725 = 85 days, No. 760 = 114 

 days, and No. 761 = 115 days. 



282 



