240 PASTORAL AND AGRICULTURAL BOTANY 



SALMON, CECIL: Cereal Investigations on the Belle Fourche Experiment Farm. Bulle- 

 tin 297, U. S. Department of Agriculture, 1915. 



SCOTT, GEORGE A. : The Feeding of Grain Sorghums to Live Stock. Farmers' Bulletin 

 724, 1916. 



SHANTZ, H. L.: National Vegetation as an Indicator of the Capabilities of Land for 

 Crop Production in the Great Plains Area. Bulletin 201, Bureau of Plant In- 

 dustry, 1911. 



STEPHENS, DAVID E.: Experiments with Spring Cereals at the Eastern Oregon Dry- 

 farming Substation, Moro, Ore. Bulletin 498, U. S. Department of Agriculture, 

 1917. 



VINALL, H. N.: Sudan Grass as a Forage Crop. Farmers' Bulletin 605, 1914. 



WARBURTON, C. W.: The Non-saccharine Sorghums. Farmers' Bulletin 288, 1907. 



WILLIAMS, THOMAS A.: Millets. Farmers' Bulletin 101, 1899. 



LABORATORY WORK 



Suggestions to Teachers. The teacher should make a collection of the root systems 

 of a number of the leguminous plants, such as the alfalfa, red clover, alsike clover, 

 crimson clover, white clover, sweet clover, soy-bean, cowpea, peanut, bonavist, kudzu 

 vine and others. Part of the material so collected should be fixed with chrom-acetic 

 acid, or some other fixative, passed up into 50 per cent, alcohol, where it should be 

 kept until it is prepared for paraffin sectioning. The other material of similar nature 

 should be kept in 70 per cent, alcohol. 



LABORATORY EXERCISES 



1. Draw a comparative series of the tubercles or nodules, of such plants as the alfalfa, 

 red clover, white clover, soy-bean, cowpea and kudzu vine. 



2. With a razor make a thin section through each of the nodules above mentioned 

 and draw the arrangement of the bacterial cells and vascular distribution with reference 

 to the rootlet on which the nodule arises. 



3. Stain and mount in balsam, paraffin sections of two or three of the tubercles of 

 two or three of the above mentioned plants. Study and draw with the high powers of the 

 microscope. * ' 



