482 MAETA M. OGILVIE GORDON. 



results are his recognition of the controlling agency of 

 ectodermal nuclei^ and of divisional processes in ectodermal 

 tissue as the means of origin of the external organic layer in 

 which are contained the primary groups of calcareous fibres. 

 These, together with his observation of the marked in- 

 dividualisation of each calcareous group, confirm the inter- 

 pretation I gave of the relationship between the ectoderm 

 and the skeletal parts. 



