Boston, March 25 - That the Martha’s Vineyard Co-operative bank, which heretofore has been a popular proposition on the Island, will soon become a certainty, and that the bank will be ready for business on the second Wednesday of April in the rooms of the Martha’s Vineyard National Bank at Tisbury, was the information given out this forenoon at the conclusion of the hearing which was held before the board of bank incorporators at Boston.