COLLECTION OF SEED. 



21 



shaken, since they should not be subjected to high temperature after 

 being released from the cones. The seed thus obtained is very clean 

 and has few impurities, except the wings, and some sand and leaves. 

 The capacity of the drying house on the Snoqualmie Forest is 50 

 bushels of cones or 62^ pounds of clean seed per day. 



Several other cone-drying houses have been constructed on the 

 National Forests, of which one of the largest is located at Ouster, 

 S. Dak., where during the four weeks from November 26 to Decem- 

 ber 24, 1910, a total of 3,894 pounds of clean seed were produced. To 



FIG. 3. Plan of seed-drying house. 



do this meant to handle 1,000 bushels per week, including drying and 

 opening, shaking out the seed, removing the wings, treating the seed 

 and putting it through a fanning mill, and weighing and sacking it 

 for shipment. 



Some species, such as yellow pine, in most cases need only a 

 thorough raking of the dried and opened cones to dislodge the seed, 

 while other species need severe and continued jarring. A variety of 

 cone shakers have been devised by members of the Forest Service. 



