MAGANLAL L. PATEL 95 
Percentage 
Strain E5 1918-19 1919-20 
Progeny of plant 1 2c + a ay 32°5 32°4 
Progeny of plant 2 ve ay es He 36°0 33°8 
The variation between the progeny of different plants is so small, and, 
moreover, the difference in the last quoted case is so slight from year to year, 
that it justifies us in concluding that we are here dealing with a hereditary 
factor. This matter, however, requires further study. 
4. The ginning percentage of kapas is hereditary. Seeing that in 
Goghari cotton it is the high ginning percentage which has raised the 
variety to its present importance, it is a matter of great interest to ascertain 
how far this quality is one which is innate in any particular strain, and 
hence whether strains can be isolated which possess this very valuable 
character in an exceptional degree, and which will breed true. Our obs@r- 
vations show that such strains can be isolated, that plants derived from 
similarly bred parents in pure line will have similar ginning percentage, and 
that the ginning percentage of the progeny. in pure strains, will only vary 
within defined limits from that of the parents. 
We will give the figures obtained for the ginning percentage in several 
pure strains and for a series of years. 
Ginning percentage 
Strain A26.. -. 1916-17 44°6 
1917-18 42°7 
1918-19 45°7, 45°4 and 46°6 
1919-20 42°5 
Strain B3 aa -. 1916-17 42-6 
1917-18 42°7, 42°8, 42°5, and 43°8 
1918-19 *  45°8 and 45°1 
1919-20 46°9 
Strain B21 .. -. 1916-17 4574 
1917-18 42°6 
1918-19 45°5 and 44°6 
1919-20 44°8 
Strain C22 1916-17 46:1 
1917-18 42°0, 42°5, 42°4 and 42°9 
1918-19 45°7 and 45°8 
1919-20 47°6 
Strain E5 ae -» 1916-17 46°4 
1917-18 46°7, 46-1 and 46°6_ 
1918-19 49°8 and 48°8 
1919-20 51°5 
The variation between the progeny of different plants of the same strain 
grown in the same year is very small indeed. Environmental factors appear 
to have a very large effect on the ginning percentage in any one year 
