EFFECTS OF MUTILATING THE SEEDS OF CORN. 5 



In harvesting, the stalks and suckers in each row were counted 

 and the numbers recorded. The approximate average height of 

 plants in each row was recorded. Each row was harvested sepa- 

 rately and the ears weighed, counted, and classified into good and 

 poor. If there appeared to be significant differences in moisture 

 content the total product of each row was dried and the compared 

 yields were based upon the dry weights. The plats were harvested 

 from 140 to 155 days after planting. 



EXPERIMENTAL DATA ON THE EFFECTS OF THE MUTILATION OF THE 

 SEED COATS AND ENDOSPERMS. 



The data presented in tabular form are dates of planting, emergence, 

 and harvesting; ratio of actual stand to the possible stand three 

 weeks after seeding; number of days from emergence to the first 

 pollen shedding; number of plants per row when harvested; total 

 and average weight of ears ; total number of ears ; average number of 

 ears ; and yield and corrected yield for each plant. 



The corrected yield of a row was calculated by the formula X = AB 

 -r- Y, in which A is the actual yield of the row, B the average yield of 

 all the check rows, Y the computed check yield for the row, and X. 

 the corrected yield of the row. In computing check yields for each 

 row, the difference between the yields of two adjacent checks is 

 divided by the number of intervening rows plus one and this quantity 

 added to or subtracted from -the yield of the successive checks as 

 computed. 



SAN ANTONIO EXPERIMENT. 



The data from the San Antonio experiment are incomplete because 

 of the effect of a long drought. Plantings were made on May 17. 

 This late planting was necessary because the soil moisture previous to 

 that date was not sufficient to insure the germination of the seed. 

 The germination was rapid and uniform. Perfect stands were re- 

 corded on May 24 from the check seed and the starchless seed, but in 

 the rows from dehulled seed and from germs there were a number 

 of missing hills. 



No differences were observed in the size and vigor of the seedlings 

 from- the check and the starchless seed. Those from the dehulled 

 seed were smaller and less vigorous than the checks. Those from the 

 germs were the smallest and least vigorous; they remained smaller 

 than the other lots for several weeks, but at harvest were not notice- 

 ably smaller. The plants from the dehulled seed at maturity aver- 

 aged slightly taller than the check. 



The date of pollen shedding was the same for the four lots, begin- 

 ning 52 days after the plants had emerged. There apparently were 

 no differences in the time of ripening, probably differences that may 



