An improvement on the above has been invented by Joseph and Charles Daniel, of Little Hanover, Pa., who have taken measures to secure a patent. The improvement consists in arranging the teeth upon the threshing cylinder in zig-zag lines along its.length while those of the concave are placed obliquely from the edges to the centre. By having the teeth arranged in this.manner the seed will be thoroughly threshed and separated, as it is subjected to two motions, being carried not only aro.und the cylinder, but likewise moved towards the centre during the rotary iriotion, previously to being" discharged upon the screen.