104 SUMMARY OF CURRENT RESEARCHES. 



mottled bands, and are considered to have been caused by them owing 

 to the brittle character of ferrite rich in phosphorus. Attention is 

 drawn to the slowness of diffusion of phosphorus in ferrite, which 

 accounts for the persistence of the non-uniform structure during the 

 heating and rolling operations undergone by the wrought-iron articles 

 before reaching the finished condition. 



