§ 10. Subject to the provisions and restrictions contained 
in the resolution of the American Museum of Natural His- 
tory, adopting rules for the establishment of the said fund, 
and for the administration and disbursement thereof, four 
members of such Board shall constitute a quorum for the 
transaction of its business. 
§ 11. No alterations shall be made in these By-Laws, 
unless at a regular meeting of the Pension Board, or at a 
special meeting called for this purpose; nor by the votes 
of less than a majority of all of the members of the Pension 
Board; nor without notice in writing of the proposed altera- 
tions, embodying the amendment proposed to be made, hav- 
ing been given at a previous meeting. 
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