10 BULLETIN 1011, U. S. DEPARTMENT OF AGRICULTURE. 
The use of the term u good development ? ' in Table II is entirely 
relative; in no instance were the plumules and roots from the sections 
equal in growth and vigor to those from the entire seeds. The 
coleoptiles and first leaves had a torn and ragged appearance, as a 
result of the mutilation of the seeds. There was no development of 
the plumule from the crown sections, but in some there were indica- 
tions of growth or viability in the plumule tips contained in these 
sections, there was a slight swelling of the tissues and a tendency to 
turn yellowish green in color.. This attempt to grow could not, or at 
least did not, persist long enough to lead to any development &f the 
plumule or to show any tendency toward a regeneration of the roots. 
Similarly, in the tip sections that showed no plumule but a fair 
development of the root system there did not appear to be any 
tendency toward a regeneration of the plumule. In the longitudinal 
sectioning of the seeds, portions of the plumule and of the radicle 
were left in each section. In the laboratory 45 seedlings showing 
plumule and foot development were obtained from 38 seeds sectioned 
longitudinally in one variety and do seedlings showing plumule and 
root development from 33 seeds in another variety. This is not 
brought out in Table II, as the percentages are based on the total 
number of sections and not on the total number of seeds. 
GROWTH AND SEED PRODUCTION OF THE MUTILATED GERMS. 
Two varieties were used in the field experiments, United States 
Selection No. 182, a white dent variety, requiring about 130 to 140 
days to ripen, and United States Selection No. 193, a yellow flint 
variety, requiring about 110 to 120 days to ripen. On May 12 entire 
kernels, longitudinal sections, cross sections, and kernels out of 
which the germs had been cut and then replaced in the same kernels 
were sown at the Arlington Experimental Farm, Rosslyn, Va. The 
injured classes were sown thickly. 15 to 20 sections to a hill. The 
crown and tip portions of the cross sections were not separated, but 
in view of the results obtained in the laboratory it seems certain that 
the plants in this class grew from the tip portions. The data.obtained 
on the field experiments are shown in Table III. 
In United States Selection No. 182 the plants from the longitudinal 
half -sections were slightly higher in average production to the 
plant, weight of ear, and number of ears to the plant than the plants 
grown from the entire seeds; the plants from the other two classes 
of injured seed were inferior to those from entire seeds. The plants 
from the cross sections were the least thrifty and were lowest in 
productiveness, weight of ear, and number of ears to the plant. 
