15 
rained heavily again, and daily thereafter to the 20th. Rains fell 
again on the 29th and 30th, and on the 4th of June. 
The Hinnian Bxperiment. (Table III.). — On the farm of Mr. 
Hinman, four and a half miles east of Bradford, was a field of 
seventy acres of corn, forty acres of w^hich v^as selected for a field 
experiment. This had been planted to corn each year since 1902, 
and injury by the root-aphis on the higher parts of the field had 
been noticed in 1904. 
This forty was divided, for the purposes of the experiment, into 
three strips. One plat ^( A) received the usual preparation of the 
land for corn. The stalks of the old corn were cut, and the ground 
was plowed from April 7 to 28, harrowed the first time May 3 and 
4, pulverized with a disk harrow on May 5, and harrowed again 
May 8. Plat C was reserved for an experiment with minimum 
cultivation. The stalks were cut, and the ground was plowed April 
7 to 28, like the preceding, and harrowed May 3 and 4 and again 
May 8. Plat B was set aside for an experiment with the effects 
of maximum cultivation, but repeated rains greatly hindered the 
farmer's work, and finally, as a consequence, this field was plowed 
like the others April 7 to 28, after the cutting of the stalks, was har- 
rowed May 3 and 4, disked May 5 and again May 8, and har- 
rowed also on the latter date. The preparation of these three plats 
thus varied as follows : — 
Plat C (minimum cultivation) differed from plat A, the check, 
only in the fact that the ground was not disked. Plat B (maximum), 
on the other hand, differed from the check only in the fact that it was 
disked a second time. B thus differed from C by two additional 
treatments with the disk harrow. It will be noticed that all the plats 
were treated alike until May 5, when the ground of two of the plats 
was first disked, and that A and B received identical treatment until 
May 8, when the latter was disked a second time. 
The entire field was planted on three different dates, the planted 
rows running crosswise of the plats. The first hundred rows on the 
north end of each plat were planted May 8, and, rains intervening, 
one hundred and sixty-four rows next south of these were planted 
May 13 and 15. Rains again followed, so packing the soil that the 
remainder of the field — one hundred and eight rows — was harrowed 
again (with an Acme harrow, sometimes called a pulverizer) and 
planted on the 22d and 23d of May. This last-planted section thus 
constituted a distinct division of the three foregoing plats, receiving 
one additional treatment with the Acme harrow, and being planted 
two weeks later than the first planting of a hundred rows and about 
a week later than the second planting of one hundred and sixty-four 
