ERRATA. 

 Page II, line 24: for Primoidal read Primordial. 



" 37, " 5: for Hodg-e, M. Jas., read Hodge, Jas. M. 



" 61, " 7: insert paper after Nitze's. 



" 74, " 26: for Bakins, I/. G., read Bakin, X,, G. 



" "75, " 22: for in the conne6lion read in connedlion. 



