CANNON: SrupiEs In Prant Hysprips 161 
in general but particularly the nature of hybridity in such forms as 
do not have distinct sexual and asexual generations might be ob- 
tained, that is, the hybrids among the seed-plants. 
THE SPERMATOGENESIS OF Hysrip Corron 
The cotton hybrid used in this study * was grown from seed 
obtained by crossing the Sea Island (Constellation brand) with 
upland (Klondike brand) cotton, Gossypium Barbadense X G. her- 
baceum. The crossing was done expressly for this study by Dr. 
H. J. Webber, of the Department of Agriculture, in the experi- 
mental plots near Columbia, South Carolina. Concerning this 
cross Dr. Webber writes as follows: 
‘The flowers were emasculated August 22, 1900, and crossed 
August 23, the resulting boll producing ten seeds ; all of the seed 
of this we sent to you. But 34a, which is of the same parentage 
and crossed at the same time in our plots at Columbia, all proved 
to be without question hybrids, being very tall and rank and 
rather unfruitful, showing in practically every character their 
hybrid nature.” He further says that ‘344 is without much 
question a true hybrid.” The seeds from the cross known as 34¢ 
were sown in pots in the propagating house at the New York 
Botanical Garden, about July 20, 1go1, and the plants that were 
derived from these seeds were used by me in this study. 
The cotton plants, 344, formed buds in October and the first 
lot for study was put up on the 2oth, and after that at intervals of 
a week or so as often as the buds appeared to be of the proper size. 
The hybrids appeared to correspond to the description that Dr. 
Webber gave for the hybrid of the same parentage, 344, and the 
346 forms were evidently true hybrids. It was evident also that 
these hybrids were fertile, but to what degree I was unable to de- 
termine, since most of the flowers were removed for study. 
Before describing the maturation divisions I may anticipate my 
results by saying that abnormal sex-cells were present in practic- 
ally all anthers, and, except in the last flowers formed, normal 
- 
*I wish here to acknowledge my obligations to Dr. Webber, who kindly made the 
crosses for me and always encouraged the work ; to Professor Underwood, “ genes 
bia University, for his counsel and assistance, and to the officers of the eb chins : 
Botanical Garden, especially to Dr. MacDougal, who placed the excellent facilities o 
the Garden at my disposal. 
