Much has been said and a great deal has been written during the past year about Blue Cross plans and their difficulties. In view of certain doubts and confusions that have arisen, it seems not only opportune but also most fitting that a careful analysis be made of a service that now makes available hospital care for almost thirty million of the American population.It is essential to have in mind the purpose of the founding fathers of Blue Cross. This may be summarized as an effort to provide financial protection against the hazards of unpredictable illness, and the plans . . .