3. Annual report of the Chairman. 4. Annual report of the Treasurer. 5. Reports of Committees. 6. Unfinished business. 7. New Business. 8. Adj ournment. ARTICLE XI SPECIAL MEETINGS Section 1 Special meetings may be called from, time to time by the Chairman or any two (2) Trustees by ten (10) days' previous notice, by regular mail, to the other members of the Board. The proof of posting in the mail being all this is required to establish notice. ARTICLE XII QUORUM Section l At all meetings three (3) Trustees shall constitute a quorum. ARTICLE XIII AMENDMENTS OF BY-LAWS Section 1 These By-laws may be amended from time to time at any regular or special meeting of the Board of Trustees, whether called for that purpose or not if such amendment receives the affirmative vote of four (4) or more members of the Board of Trustees.