LABORATORY EXERCISES 253 



plished. The best results can be obtained by making the 

 selection of these resistant strains in the locality in whicji 

 they are to be grown. The plants which mature in a field 

 attacked by flax wilt should be harvested and the seed care- 

 fully saved. It is only by growing these resistant plants 

 that strains which are not subject to the disease can be devel- 

 oped. 



LABORATORY EXERCISES 



If material is available, have the class study the plants and describe 

 them as they have done with the other grains. Samples of seed may 

 be judged on the size and uniformity of the grain, freedom from green 

 and shriveled seed, and freedom from other grains, weed seeds, and 

 trash. 



SUPPLEMENTARY READING 



Farmers' Bulletins: 



27. Flax for Seed and Fiber. 

 274. Flax Culture. 



Cyclopedia of American Agriculture, Vol. II, pp. 293-302. 

 Hunt's Forage and Fiber Crops in America, pp. 386-394. 

 Manual of Flax Culture (Orange Judd Co.) 

 Wilcox and Smith's Farmers' Cyclopedia of Agriculture, pp. 50-52. 



