ten o'clock before
I listed all the ingredients in one column , and then filled up the adjacent columns with all the possible substitutes I could think of . I did n't even know it when Susan arrived at the office , stood in my doorway for a moment , and then tip-toed away . Later on Mr. Spardleton looked in on me , and I was n't aware of that , either . It was ten o'clock before I finally came up for air , and then I dashed out to the Marchare Laboratory for another talk with Callahan . I explained how I was going to handle the case to make sure we got a good , broad patent application into the Patent Office . `` Can you do that ? '' he asked .