138. Where proposals for compositions or schemes are made by a firm, and by the partners therein individually, the proposal made to the joint creditors shall he considered and voted upon by them apart from every set of separate creditors; and the proposal made to each separate set of creditors shall be considered and voted upon by such separate set of creditors apart from all other creditors. Such proposals may vary in character and amount. Where a composition or scheme is approved, the receiving order shall be discharged only so far as it relates to the estate the creditors of which have accepted the composition or scheme.