1. A SUBSTANTIALLY DRY MIXTURE ADAPTED FOR USE AS AN ADHESIVE IN THE MANUFACTURE OF CORRUGATED BOARD, CONSISTING ESSENTIALLY OF FLOUR SELECTED FROM THE GROUP CONSISTING OF CEREAL AND TUBEROUS FLOURS, SAID FLOUR HAVING A PARTICLE SIZE WHEREAT AT LEAST 80 PERCENT PASSES A USS NO. 200 SIEVE AND NOT MORE THAN 1 PERCENT REMAINS ON A USS NO. 70 SIEVE, AND A GUM SELECTED FROM THE GROUP CONSISTING OF CARBOXYMETHYLCELLULOSE, HYDROXYETHYLCELLULOSE, METHYLCELLULOSE AND OKRA GUM, THE RATIO OF GUM TO FLOUR FROM ABOUT .005 TO ABOUT .05 PART BY WEIGHT OF GUM TO ABOUT ONE PART BY WEIGHT OF FLOUR.