168 SCIENCE OF SUCCESSFUL THRESHING. 



the seed can be cleaned better by using the three-thirty- 

 seconds by one-half-inch oblong-hole special sieve, U, under- 

 neath the adjustable shoe-sieve. It should be placed in the 

 seventh or eighth notch and sixth hole. The adjustable shoe- 

 sieve should be placed in the second notch and third hole. If 

 common-sieves be used, place the one and one-quarter-inch 

 lip sieve, E, in/ the conveyor. Use the three-quarter-inch 

 lip sieve, F, as an upper sieve in the shoe placed in the 

 first notch and third hole. Us'e the three-thirty-seconds by 

 one-half-inch special orchard-grass sieve., U, below, placing 

 it in the same position as when used with the adjustable one. 

 But little wind is required, and if the grass be reasonably 

 free from weeds, the lower blinds may be entirely closed and 

 the upper ones opened a little. If the grass be damp or 

 dirty, slightly open the lower ones also. From twelve-hun- 

 dred to fifteen-hundred bushels of orchard-grass have been 

 threshed in a clay with a medium sized machine. 



Threshing Kafir-Corn. The three principal varieties of 

 Kafir-corn the white, the red and the black-hulled white, 

 (African-millet), are known by various names, such as "red- 

 top" or "sumac-cane", "milo-maize", "black-amber-cane", 

 "guinea-corn", etc. Any of these may be successfully 

 threshed with a "Case" separator. When the machine is 

 kept continually threshing crops of this sort, it is best to use 

 the "Texas" straw-rack, which is made especially for this 

 work. The general directions for wheat may be followed in 

 regard to the cylinder and concaves, speed and cleaning 

 apparatus. 



