
    Boston Stock Exchange et al., Appellants, v State Tax Commission et al., Respondents.
    Reargued September 8, 1977;
    decided September 13, 1977
    
      
      Roger Pascal of the Illinois Bar, admitted pro hac vice, Milton H. Cohen, Alton B. Harris and Ann Rae Heitland for appellants.
    
      Louis J. Lefkowitz, Attorney-General (Robert W. Bush and Ruth Kessler Toch of counsel), for respondents.
   Concur: Chief Judge Breitel and Judges Jasen, Gabrielli, Jones, Wachtler, Fuchsberg and Coóke.  