190 LABORATORY MANUAL OF AGRICULTURE 



separating the sample into the following classes: round, 

 cylindrical, oval, flat oval. Count and record the number 

 of potatoes in each group. 



Size. Separate the potatoes into groups of large, me- 

 dium, and small size. Count and record the number in 

 each group. 



Color of Skin. Separate the potatoes into the following 

 groups : yellowish, white, pink, russet, red, and other colors. 

 Count and record the number of potatoes in each group. 



Texture of Skin. Separate the sample into the following 

 groups based upon the texture of the skin: corky, netted, 

 medium smooth, very smooth. Count and record the num- 

 ber in each group. 



Depth of Eyes. Separate the sample into the following 

 groups, based upon depth of eyes: deep, medium, and 

 shallow. Count and record the number in each group. 



Condition. Make a study of condition by separating 

 the sample of potatoes into the following groups: clean, 

 broken or cracked, and diseased. Count and record the 

 number of potatoes in each group. 



Select from the sample five large, five small, and five very 

 rough and knotty potatoes. Weigh each group of five sep- 

 arately and record weight. Peel the potatoes in each group, 

 removing as nearly as possible the same thickness of peeling 

 in each case. Weigh, and record the weight of the peeled 

 potatoes of each group. Subtract these weights from the 

 first weights to determine the weight of peeling in each group. 

 Determine the per cent of waste in each group. 



Record the data in the accompanying outline form. 



