120 



F. G. E. Pautard 



And if mitochondria are involved in the metabolic transfer of mineral to a site, 

 then it is likely that there will be genetic information separate from the nucleus to 

 do so, and we can look forward to the exciting possibility that the evolution of 

 mineralization may be separate from the cell which makes use of it. 



APHIDES 



ENAMEL 



Fig. 4. Diagram of intracellular mineralization ot comparable tissues. The pathway of the calcium salts within 

 each cell is shaded tentatively 



References 



Arnott, H. J.: Studies of calcification in plants. 3rd European Symposium on Calcified 



Tissues (in press). 

 — , G. Bevelander, and F. G. E. Pautard: (in press). 

 — , and F. G. E. Pautard: (in press). 

 — — , and H. Steinfink: Nature (Lend.) (in press). 

 AscENZi, A., C. pRANgois, and D. S. Bocciarelli: On the bone induced by oestrogens in 



birds. J. Ultrastruct. Res. 8, 491 (1963). 



