A STUDY Of COWPEAS 149 



Spread the sample out on a blank piece of paper and make 

 a detailed study of it for each of the divisions given below. 



Purity. Make a study of purity by separating the sample 

 into the following groups : cowpeas of variety class ; cow- 

 peas of other varieties ; other seeds ; foreign matter. Weigh 

 each group and record its weight and per cent on the blank 

 form in the column of that sample number. Weigh ac- 

 curately to one half of one gram. Quantities less than one 

 half of one gram may be indicated as " trace." All the groups 

 for this division should total 100 per cent for purity. For 

 the remainder of the determinations of this study use ten 

 grams of cowpea seed which has been separated from 

 other grain and foreign matter. 



Condition. Make a study of condition by separating 

 the ten-gram sample into the following groups : sound seed ; 

 cracked or broken seed ; moldy and otherwise injured seed. 

 Weigh, and record the weight and per cent of each group. 

 The total for condition should be 100 per cent. 



Color. The color of cowpea seed depends largely upon 

 the type and variety. There is little variation in color 

 in a pure variety. Make a study of color by separating 

 the sample into the following groups : white, light brown, 

 dark brown, mottled, gray, black, white with black eye. 

 Use named type samples of color in determining color of 

 sample. Weigh, and record weight and per cent of each color. 

 The total for color should be 100 per cent. Separate from 

 the sample 100 average-size seeds. Weigh, and record 

 their weight. Determine the weight per bushel of sample 

 as described in Ex. 27. Record all data on blank form. 



