7:13
Ten minutes later he was on his way to the station with the little wooden case containing the precious antitoxin , wrapped and addressed , in his pocket . It was seven by the Arlington Street Church clock as the cab rattled down Boylston Street . A tangle of a trolley car and a market wagon delayed it momentarily at Harrison Avenue and Essex Street . Dr. Payson , leaning out as the carriage swung into Dewey Square , saw by the big clock on the Union Station that it was 7:13 . He had lost the train . Now , the assistant had been assistant long enough to know that excuses -- in the ordinary sense of the word -- did not pass current with Dr. Morgan . That gentleman had telegraphed for antitoxin , and said it was important that he should have it ; therefore , antitoxin must be sent in spite of time-tables and forgetful butlers .