34 HINDI COTTON IN EGYPT. 



usually results in a favorable intensification of the lint characters in 

 the first generation. Xotwithstanding the inferiority of the lint of 

 the Upland parent, the lint of the hybrid is usually longer and 

 stronger than that of a pure Egyptian progeny grown under the 

 same conditions." 



A form of intensification occasionally shown in Egyptian-Upland 

 hj^brids is an unusual development of the nectaries. An excellent 

 example of this was found in an aberrant plant at Calioub, July 12, 

 11)10. It was probabh^ a Hindi hybrid, though showing no pro- 

 nounced Hindi characters. It w^as much taller than its neighbors 

 and had unusually long basal internodes on the fruiting branches, 

 Avhile the other internodes were short and imperfect. Many buds 

 had aborted and no bolls had been set. Each of the involucres that 

 remained on the plant, 15 in number, had a large nectary on each of 

 the three bracts. 



In order to give a more definite indication of the extent of intensi- 

 fication shown b}^ the nectaries of this plant, notes were made of the 

 occurrence of nectaries on the involucral bracts of six adjacent plants, 

 one of which happened to be Hindi. The lower buds of the Egyptian 

 plants were generally without nectaries, unlike the Hindi plant which 

 had nectaries on the earh^ as well as on the later involucres, though 

 with no such regularity as in the aberrant plant, to say nothing of 

 the much larger and more regular size of the nectaries of the aber- 

 rant plant. Table III shows the distribution of nectaries on all the 

 involucral bracts of the EgA^ptian and Hindi plants. Bracts Avith 

 large nectaries are indicated as " N," those with small nectaries as 

 " n,-' those with no nectaries as " o." No nectaries as large as those 

 of the aberrant plant were found on any of the neighboring Egyptian 

 and Hindi individuals. Several other plants were examined in addi- 

 tion to those that were definitely counted. One of the Egyptian 

 plants had an involucre with onlv two bracts, a not uncommon 

 occurrence. 



"Suppressed and Intensified Characters in Cotton Hybrids, liulletin 147. 

 Bureau of Plant Industry. U. S. Dept. of Agriculture, 1000. 

 210 



