J-IHKR CROPS 



Burs: heavy not n>lled, thin rolled; blunt pointed, sharp pointed; number 

 of carpels 



Locks: no. of seeds per lock ; sketch arrangement; adherence to 



bolls, compact or flabby. 



Seeds: fuzzy, naked; if fuzzy, white, green, brown; if naked, black, brown; 



large, small; length of 5 placed end to end in. Is the hilum at 



large or small end? ; where does longest lint occur? 



Lint: average length, in.; white, amber, brown; clean, dirty; 



strong, medium, weak; abundant, medium, scarce. 



487. STUDY OF COTTON IN THE LABORATORY. Give each student 5 open 

 bolls of cotton from each of 

 three regions of the plant 

 base, middle, and top, and 

 from three types; as, sea 

 island, long staple upland, 

 and short staple upland; or 

 three varieties; as, Peterkin, 

 King, and Truitt. These 

 should be picked and allowed 

 to dry a couple of weeks be- 

 fore using. The data ob- 

 tained will permit a com- 

 parison between cotton from 

 different parts of the same 

 plant, and that from differ- 

 ent types or varieties. 



(a) Length of lint: average 



of 5 determinations 

 In deter- 

 mining length of lint, 



take a small sample from the middle portion of the seed. As far as 

 possible, the middle seed of each lock should be taken. Note uniformity 

 of length of lint over all portions of the seed. 



(b) Percentage of lint: average of 5 determinations Gin by hand 



one lock from each boll, and weigh separately total seed cotton and 

 ginned seeds; the difference will be the amount of lint. 



(c) Determine number of seeds in each lock, and note amount of fuzz and 



color. From above data calculate: 



1. Number of bolls required to make 1 Ib. seed cotton; 



2. Number of bolls required to make 1 Ib. lint cotton; 



3. Number of seeds to the pound. 



Fiber testing machine l 



1 This machine was used by the U. S. Department of Agriculture. Other 

 fiber-testing machines are made by A. S. McKenzie, corner llth St. and Ridge 

 Ave., Philadelphia, Pa. 



