Soyabean futures on the Chicago Board of Trade tumbled at midsession on Wednesday, with front-month January falling to the lowest level in more than a week as crude oil prices fell, traders said. As of 11:22 am CST (1722 GMT), January soyabeans were down 18 cents at $10.26 a bushel. CBOT corn and wheat also slipped, with March corn down 4 cents at $3.81 a bushel and March wheat down 5-3/4 at $5.34.