Section 608. Quorum of shareholders

(a) The  holders of a majority of the votes of shares entitled to vote
  thereat shall constitute a quorum at a meeting of shareholders  for  the
  transaction  of  any  business,  provided  that when a specified item of
  business is required to be voted on by a particular class or  series  of
  shares,  voting  as  a  class, the holders of a majority of the votes of
  shares of such class  or  series  shall  constitute  a  quorum  for  the
  transaction of such specified item of business.
    (b) The  certificate  of  incorporation or by-laws may provide for any
  lesser quorum not less than one-third of the votes of shares entitled to
  vote, and the  certificate  of  incorporation  may,  under  section  616
  (Greater requirement as to quorum and vote of shareholders), provide for
  a greater quorum.
    (c) When  a  quorum  is  once present to organize a meeting, it is not
  broken by the subsequent withdrawal of any shareholders.
    (d) The shareholders present  may  adjourn  the  meeting  despite  the
  absence of a quorum.