1. IN A COUNTERCURRENT EXTRACTION PROCESS WHEREIN A VEGETABLE MATERIAL IS MOVED THROUGH AN EXTRACTION ZONE IN A DIRECTION FROM THE HEAD END OF THE ZONE TO THE TAIL END OF SAID ZONE, WHILE A SOLVENT IS CONCOMITANTLY MOVED THROUGH THE EXTRACTION ZONE IN THE OPPOSITE DIRECTION AND WHEREIN THE TOTAL SOLVENT FOR THE EXTRACTION INCLUDES (A) SOLVENT CONTAINING DISSOLVED MATERIAL AND (B) SOLVENT RELATIVELY FREE FROM DISSOLVED MATERIAL, THE IMPROVEMENT WHICH COMPRISES FEEDING THE SAID SOLVENTS SEPARATELY INTO THE EXTRACTION ZONE, SOLVENT (A) BEING INTRODUCED AT THE TAIL END THEREOF AND SOLVENT (B) BEING INTRODUCED AT A POINT SPACED FROM THE TAIL END IN A DIRECTION TOWARD THE HEAD END, WHEREBY TO REDUCE THE AMOUNT OF DISSOLVED MATERIAL WHICH IS CONTAINED IN THE EXTRACT PRODUCED BY THE PROCESS.