exchax(;e of iMiosrnoRrs ix tkkii 



17:> 



in close proximity to t]i(> ])vjlp from which 11 is derived, while the 

 tissue formed a1 an earlier date is pushed aloni,^ in lh(> direction of" 

 jrrowth; 



b) the labelled phosphate is equally distributed throughout the incisor. 



(Jutting incisors tranversally into pieces and analysing these separa- 

 tely revealed the fact that the largest part of the labelled phosphate 

 is found in those regions of the incisor where the pulpa is strongly deve- 

 loped, but that some of the labelled phosphate is found all through 

 the incisoral tissue (Tables 5 and 6). 



Table 5. Distribition of Labelled Phosphorus, Contained 



IN THE Normal Diet. Found in the Incisor after 2 days. Weight 



OF THE Rat 210 gm -f- Denotes Upper — Lower Teeth 



Percentage of labelled P found in the total incisors = 1.85. Average 

 per 1 mgm ash = 0.005. Biggest ratio between proximal and distal 

 end = 60. 



Table 6. Distribution of Labelled Phosphorus, Administered 

 IN the Normal Diet, found in the Incisor after 7 Days. Weight 



of the Rat 240 gm 



Part of the incisor 



Weight of ash 

 in mgm 



Proximal I + [ 25.0 



Proximal Il-f 23.6 



Proximal I -^ 21.8 



Proximal II 4- 31.6 



.Middle+ ' 81.6 



Middled : 68.0 



Distal -f and -f- i 20.3 



% of labelled P 

 taken found 



% of the labelled 

 ,r per mgm ash 



0.28 



0.31 



0.29 



0.32 



0.204 



0.206 



0.020 



0.011 



0.013 



0.(»13 



0.010 



0.0032 



0.0031 



0.00074 



Percentage of labelled P found in the total incisors = 1.69. Average 

 percentage per 1 mgm ash = 0.006. Biggest ratio between proximal 

 and distal part = 18. 



