When any such plan and agreement shall have been approved by the commissioner, with any changes required by him, the same shall be approved in the case of each domestic mutual insurer that is a party to the transaction by not less than two-thirds of the votes cast by the members thereof represented in person or by proxy at a meeting called to consider the same. At least 30 days before the day fixed for the meeting, notice of such meeting and its purpose shall be given to the members at their addresses appearing on the books maintained at the home office of the insurer. With respect to members whose addresses do not appear on such books of the insurer, notice shall be deemed to have been given if published at least once in some newspaper of general circulation in the county in which the principal office of the insurer is located. At such meeting the presence in person or by proxy of 10 percent of such members of such insurer shall constitute a quorum. In the absence of a quorum the members present at the meeting in person or by proxy may adjourn the meeting to a later date. No further notice need be given of the date to which the meeting is adjourned.