الفهرس 
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Abstract
This study was carried out at Plant Production Department Laboratories, Faculty of Agriculture (Saba-Basha), Alexandria University, Cotton Research Institute , ARC , Giza and Cotton Arbitration and Testing General Organization (CATGO), Egypt, on some Egyptian cotton varieties , lint grades and some instruments, during 2018 season.
Six commercial Egyptian cotton varieties representing the two categories of Egyptian cotton were used .
Each variety including three lint grades as follows; Good to Fully Good (G/FG), Good (G) and Fully Good Fair to Good (FGF/G) .
For fiber properties, all tests were performed at the laboratories Fiber and Spinning Testing Sector of cotton tests at the Cotton Arbitration and Testing General Organization (CATGO), Alexandria, Egypt.
Cotton lint grade: was performed by an Experts committee from Cotton Arbitration and Testing General Organization (CATGO), specialists as a determination of foreign matter content on the Egyptian grading scale.
For yarn properties: all tests were tested at the cotton technology Research Laboratories, Cotton Research Institute, Agricultural Research Center (ARC) , Giza, Egypt. Statimat ME Tester used to determine yarn strength and yarn elongation and Uster Evennes Tester to measure yarn imperfections .
The attained results in this investigation will be presented here in two experiments:
First Experiment :
A: Extra-long Egyptian cotton varieties (V) (Giza 87and Giza 96) ( over 1 3/8 inch fiber length = > 35 mm) were processed to combed yarns Ne 80.
Second Experiment :
B: Long Egyptian cotton varieties (V) (Giza 86, Giza 94, Giza 95and Giza 90),