Grains closed mixed on the Chicago Board of Trade Wednesday with wheat making modest gains on signs of stronger demand. Corn was off 4 to up 1/4; soybeans were off 14 3/4 to off 21 3/4; wheat was up 3 1/4 to up 6 3/4 and oats were off 1 3/4 to up 1/2. Corn and soybean futures fell with pressure from a stronger dollar. On the International Exchange, the dollar index, a pro-rated measure of the dollar compared to six major currencies, added 0.42 percent to 82.92. Wheat held off pressure from the dollar and corn to make modest gains mostly in the 3 cents to 6 cents range. The prices: Corn: Mar 7.41 1/4 up 1/4; May 7.10 1/4 off 4; Jly 6.92 1/4 off 1 1/2; Sep 5.79 1/4 off 2 3/4. Soybeans: Mar 14.75 off 14 3/4; May 14.47 off 21 3/4; Jly 14.25 off 20 3/4; Aug 13.82 3/4 off 16 1/4. Wheat: Mar 7.07 1/4 up 6 3/4; May 7.10 up 6 1/2; Jly 7.08 1/4 up 4 1/2; Sep 7.13 3/4 up 3 1/4. Oats: Mar 4.23 1/4 off 1 3/4; May 3.92 1/4 off 1 3/4; Jly 3.82 1/2, up 1/2; Sep 3.72 1/4 up 1/2.