March 24, 1948. Appeal from Unemployment Insurance Appeal Board. Foley Martin for appellant. Nathaniel L. Goldstein, Attorney-General ( Wendell P. Brown, Solicitor-General and Francis R. Curran, Assistant Attorney-General of counsel), for respondent. DEYO, J. This is an appeal by an employer from a decision of the Unemployment Insurance Appeal Board which affirmed the decision of a referee, and sustained an assessment against the employer for contributions upon the wages of persons employed on nonself-propelled