GRASSES OF IOWA. 123 



They have given numerous references to the work of Euro- 

 pean and American investigators. Amoog the latter we desire 

 especially to mention the works of Goff* and Latta. f 



The work of Arthur and Golden is in the line of our own 

 work. We quote from their results as follows: "Thirty kernels 

 from a single ear of white dent corn were separately weighed, 

 of which six grew that were over 400 milligrams each, and nine 

 that were under 300 milligrams each. The product of these 

 gave a greater average weight of ears for the large than for 

 the small seed, which was also true of the cobs and kernels 

 taken separately. ' ' 



The accompanying graphic illustration of the results brings 

 out the difference in the weight of the kernels even more 

 strikingly. The solid line indicates the product from the large 

 seed and the interrupted lines from the small seeds. The dia- 

 gram as a whole shows the variation at different parts of the 

 ear, the butt being to the left and the tip to the right. 



"The kernels from each ear of the product were removed and 

 weighed by fifties, beginning at the end of the ear and pro- 

 ceeding in order to the other. The average of all of the heav- 

 iest fifties, one from each ear, gave the maximum weight, 

 marked M in the diagram. The average of the fifties ranging 

 first, second, third, etc., right and left of the maximum was 

 then found. Thus the diagram represents the difference of 

 the weight of the kernels of the ear in the order they occupied 

 on the cob, the butt of the ear lying to the left and the tip to the 

 right of the diagram. 



The figures below the diagram indicate the position of each 

 fifty seeds on the ear; the figure at the left gives the average 

 weight in grams of fifty seed. Webbert states that "Roujon, 



*Ann. Rep. N.Y. AgrlExp. Sta. 3: 199. Ann. Rep. N. Y. Agrl. Exp. Sta. 4: 181. 

 128, 120. 



tBuU. Indiana Agrl. Exp. Sta. 27: 32: 14. 



^Influence of environment In the origination of plant varieties. Year booli U. S. 

 Dept. Agrl. 1896: 02. 



