LINT PERCENTAGE AND LINT INDEX OF COTTON. 



index, a departure from which will be considered an indication of 

 either merit or demerit for a variety. The better varieties of Upland 

 long-staple cottons have been found thus far to have a lint index of 

 5 to 6, and the better varieties of Upland short staples a lint index of 

 7 to 8. Varieties have been examined which were found to have a lint 

 index as low as 4, and one variety was seen with a lint index of 9.50. 



In order to facilitate the finding of lint indexes Table I has been 

 prepared, in which the lint indexes, corresponding with various 

 weights of seed and percentages of lint, are given. This table prob- 

 ably covers the range of commercial varieties. In using it the per- 

 centage of lint and the weight of 100 seeds of the variety or selection 

 are first ascertained ; then the lint index may be found in the column 

 under the lint percentage, opposite the weight of the seeds. For 

 example, a variety in which the seeds weigh 12 grams per hundred 

 and which gins 35 per cent of lint will have a lint index of 6.46; 

 that is, the lint ginned from 100 seeds will weigh 6.46 grams. 



Table I. — Lint index of a sample of cotton when the weight of 100 seeds and the 

 percentage of lint are known. 



[Formula: Weight of seed -f- percentage of seed X percentage of lint = lint index.] 



• Weight of 100 ginned 

 seeds. 



€.0 grams. . . 

 6.5 grams... 

 7.0 grams. . . 



7.5 grams. . . 

 8.0 grams... 

 8.5 grams... 



9.0 grams... 

 9.5 grams... 

 10.0 grams.. 



10.5 grams. 

 11.0 grams. 

 11.5 grams.. 



12.0 grams. 

 12.5 grams. 

 13.0 grams. 



13.5 grams. 

 14.0 grams. 

 14.5 grams.. 



15.0 grams.. 

 15.5 grams.. 

 16.0 grams.. 



Percentage of lint. 



26 27 I 28 29 30 31 32 33 34 35 



In- In- In- j In- 

 lex.ldex. dcx.'dex. 

 1. 00|2. 1012. 24 2. 33 

 2. 16:2. 2812.40 2. 53 

 2. 33 2. 46,2. 59 2. 72 



In- 

 dex. 

 2.45 

 2.65 

 2.86 



2.5012.63 2.77 2.92 3.06 

 2.66 2.812.96 3.113.27 

 2. 8312.98 3. 14 3. 30,3. 47 



'3. 00 3. 16 3. 32 3. 50'3. 67 

 '3. 16'3. 33 3. 51 3. 69 3. 88 

 : 3.33 3.513.69i3.89;4.0S 



3. 50 

 J3.67 

 .3.83 



3. 69 3. 88 4. 08 4. 28 

 3.86 4.07 4.2814.49 

 4. 02,4. 25 4. 4714. 



4. 00 4. 21 '4. 43 

 4. 16 4. 36 4. 62 

 4. 33 4. 58 4. 81 



4. 504. 74 ! 5. 00 

 4.68 4.91;5.17 

 4. 83 5. 10 5. 36 



In- In- In- 

 dex. I'dex. dex. 

 2.572.69 2.82 

 2. 78 2. 923. 06 

 3.00 3.14,3.29 



In- 

 dex 

 2.95 

 3.20 

 3.45 



3. 21 3. 36 3. 53 3. 69 

 3. 43 3. 59 3. 76 3, 

 3. 64,3. 82 4. 00 4. 19 



3.8514.04 4.23 4.43 

 4. 07 4. 2714. 47 4. 

 4.28 4.49 4.714.92 



4,50 4.714.94 5.18 

 4.71J4.95 5.18 5.42 

 4. 93 5. 17 5. 41 5. 67 



In- 

 dex. 

 3.09 

 3.35 

 3.61 



In- 

 dex. 

 3.23 



In- 

 dex. 

 J3.37 

 3. 50 3. 65 3. 81 

 3.77 3.944.11 



37 3S 



In- In- 

 dex. \dex. 



3.52 



3. 86 4. 02 

 4. 12 4. 31 

 4.38,4.58 



4. 63!4. 85 

 4.90 5.11 

 5. 15 5. 39 



5.41 

 5.67 

 5.92 



4. 6714. 90 5. 14|5. 3815. 64 5. 91 6. 17 

 4. 865. 11 5. 3615. 62 5. 88 6. 16 6. 43 

 5. 05i5. 30,5. 57 5. 84,6. 11 6. 41,6. 71 



5. 23 ] 5. 51 5. 776. 07'6. 35'6. 65 ! 6. 95 7. 26i7. 59 7. 93 

 5. 45 5. 71 6. 00 6. 29 6. 586. 89 7. 21 7. 54 7. S8 8. 22 

 5. 53 5. 92 6. 21,6. 51 6. 82i7. 13 7. 47 7. 80|8. 15 8. 52 



5.65 

 5.93 

 6.19 



4.214.40 

 4. 50 4. 69 

 4.78,4.99 



5. 06 5. 28 

 5. 34'5. 58 

 5. 6215. 87 



5.91 



6.18 



6.17 

 6.45 

 6.76 



3. 



3.98 



4.29 



4.60 

 4.91 

 5.21 



5.52 

 5.82 

 6.13 



6.43 

 6.75 

 7.05 



6.46 6.75 7.05 7.35 

 6.74 7.037.33 7.67 

 7.00,7.3017.63 7.97 



5. 00 5. 27 ! 5. 55 5. 83 6. 12 6. 4316. 74 7. 06 7. 38 

 5. 17 5. 45 5. 73 6. 03 6. 33 6. 54 6. 97 7. 29 7. 63 

 5. 33 5. 62 5. 92,6. 22 6. 53 6. 86,7. 19 7. 52 7. 88 



7.72 

 7.97 



8.24 



8.06 8.43 8.81 

 8. 35 8. 72 9. 10 

 8.619.00 9.38 



8.27 



8. 58 



9.19 

 9.50 

 9.81 



39 



In- 

 dex. 

 3.83 

 4.15 

 4.47 



4.80 

 5.11 



5.44 



5.75 

 6.08 

 6.39 



6.71 

 7.03 

 7.36 



40 41 



In- 

 dex. 

 4.00 

 4.33 

 4.67 



5.00 

 5.33 

 5.67 



6.00 

 6.34 

 6.67 



7.00 

 7.35 



7.68 



7.67 8.00 

 8.00 8.34 

 8.35 8.66 



8.62 

 8.94 

 9.26 



9.58 

 9.93 

 10.22 



9.00 

 9.35 

 9.65 



10.00 

 10.33 

 10.66 



In- 

 dex* 



4.16 

 4.51 

 4.86 



5.2" 

 5. 5fc 

 5.91 



6.25 

 6.60 

 6.95 



7.30 

 7.65 

 8.0L 



In- 

 dex. 

 4.34 

 4.71 

 5.07 



5.44 

 5.80 

 6.15 



6.52 



6.88 

 7.24 



7.60 



7.98 

 8.33 



8.3-: 8.68 

 8.68, 9.05 

 9.04 9.40 



9.37 9.77 

 9. 73 10. 01 

 10.06jl0.50 



10.1610.33 

 10.76 11.22 

 11.1111.57 



ILLUSTRATIONS OF THE RELATION BETWEEN LINT PERCENTAGE 



AND LINT INDEX. 



A few examples of possible combinations of characters that may 

 be found in varieties, as shown in Table I, are here given to illustrate 

 the relation between lint percentage and lint index. 



