CHARACTERS IN AN UPLAND-EGYPTIAN COTTON HYBRID. 41 
Boll locks strongly concave toward the apex (PI. IX, fig. 7), a character which is 
perhaps associated with deficient fertilization. 
Constriction of the boll about midway between the base and the apex.- ' 
Boll ending in a long, sharp point (PI. IX, fig. 6). This character is not nearly 
so frequent and pronounced as in hybrids between Pima and sea-island cottons. 
External grooves which correspond to the partitions between the locks terminating 
far above the base of the boll (PL IX, figs. 16 and 18). In Pima cotton these grooves 
extend always to the base of the boll and in Holdon very nearly or quite to the base. 
In the F 2 extreme the grooves terminated at less than two-thirds of the distance from 
the apex of the boll and in 11 of the 215 F 2 individuals at not more than three* 
quarters of the distance. 
Fuzz or short hairs of the seed coat longer than in the parent variety (Holdon") 
which has the longer fuzz. 
Occasionally two or more of these characters, such as presence 
of red color in the vegetative organs and also in the petals, were 
associated in the same individual, but as a rule the extraparental 
characters seemed to be as independent as were most of the char- 
acters expressed in the parents. Many of them were regularly 
expressed in the offspring from self -fertilized seed. Thus the con- 
spicuous bluish white color of the foliage of plant No. 61 appeared 
without diminution in all of the 22 plants which constituted its F 3 
progeny (Pi. XIII, fig. 1). Other extraparental characters of F 2 indi- 
viduals which were recorded as having been expressed with great 
regularity in their F s progenies were extreme limbiness, various sorts 
of pubescence, exceptionally light or dark color of the foliage, excep- 
tional thinness or thickness of the leaves, sinuate or undulate leaf 
margins, cupped leaves, reduced number of leaf lobes, rough deeply 
pitted surface of the boll, extension of the boll into a long sharp 
point, and exceptionally light or dark color of the boll. 
Characters of a definitely pathological nature also appeared in F 2 . 
Various deformities of the reproductive organs were observed (PL 
YIfI, fig. 8,) the most serious being imperfect development of the 
anthers, which will be further considered in the discussion of sterility. 
Tomosis, or leaf-cut (Cook, 14), a presumably physiological malady 
which occurs in Arizona in a high percentage of the very young 
cotton plants but does not normally persist in the later stages of 
development, was present in a pronounced degree in 9 of the 21.") 
adult plants of F 2 (PI. XXI, figs. 1 and 2) and in a less marked degree 
in several others. The symptoms were crumpling or buckling of the 
leaves, with failure to develop of a portion of the foliar tissue. 
Inheritance of a tendency to this condition was clearly shown in F 3 
progeny Xo. 19. 
STERILITY IN F 2 AND F 3 OF THE HOLDON-PIMA HYBRID. 
A thorough investigation of the manifestations of sterility in the 
Holdon-Pima hybrid was not undertaken, but it seems advisable : i 
record such observations as were made. 
The first generation of hybrids between Holdon and Pima, as 
between upland and Egyptian cottons in general, is extremely fertile, 
much more so than either parental variety, and this notwithstanding 
the fact that there is often a Considerable loss from shedding of buds 
and young bolls, probably caused by the rapid and vigorous growth 
of the I\ plants. 
»Thfi occurrence of this character was noted by Marshall . p. GlHn the stvond ge» 
hybrid between Egyptian cotton and Hindi, an uplandiike type which occurs as a weed in cotton fields 
i n Egypt. 
