"Who approaches?" demanded a muffled voice from within.
"Tell him 'Two drivers oof racing-cars,' Matt," whispered Carl. "My voice vouldt gif me avay."
"Two drivers of racing-cars," called Matt.
"Give me the countersign."
"Four speeds forvard und vone referse," whispered Carl.
Matt repeated the words. Instantly the door was opened and a young man of twenty-two or three stood in front of the boys.
With a bellow of rage Carl jumped forward.
"Higgins! Oof it ain'd! Now vatch, Higgins, vile I show you der peautiful aurora porealis, und der leedle shooding shdars, und der comics. Dis meeding makes me so habby as I can't dell!"