INJURIOUS INSECTS OF I909Q AND IQIO. 47 
were added up, and we found that of the treated plants there had 
been 48 marked by the maggots, and six not marked, and of the 
checks 113 marked, and 13 free; two rows, one on either side of 
the treated row, having been used as checks. From this standpoint, 
nothing is shown in favor of the treatment. A few plants were 
left after the last count, but these were not examined, as the second 
brood of maggots was now coming on, and any treatment would 
by this time have fulfilled its purpose on the first brood. 
On July 16th, after a portion of the plants in this field had been 
harvested, we counted the number of heads that were tied up, and 
also all that promised the development of marketable heads, in both 
the check rows and the treated rows, with results as follows: 
Check on one side.. 44 tied, 20 to be tied. 
ARNE ALed cy roca sisse < 58 tied, 21 to be tied. 
Check other side.... 61 tied, 15 to be tied. 
This shows but little, if anything, in favor of the treatment. 
Experiments with Tarred Felt Discs. 
Cauliflowers planted May 14th were treated with tarred felt 
discs, 825 plants having discs applied. These plants also belonged 
to Mr. Fisher, of St. Anthony Park. These treated plants were 
in three rows, and check rows were left between and on both sides 
of them, so that the check and treated rows alternated. The discs 
were bought already cut, and they cost $2 for the 825. It took 
three men an hour to apply them to the plants. 
On May 28th these plants were examined, and the discs were 
found badly covered up with dirt on account of the cultivation. 
The dirt was brushed off of the discs on this date. These plants 
were cultivated on May 28th and again on June 7th. The cultiva- 
tion threw the soil over the rows in such a manner as to cover up 
the discs to a depth of a couple of inches or more. On June 15th 
the soil was again removed from the discs. As Mr. Fisher began 
to harvest these plants on July 12th, and had thrown out the roots 
where they had dried up, we were unable to begin making counts 
until July 14th. The roots of plants which were small and did not 
make heads were pulled up and examined, as well as the cut-off 
roots which were left in the ground by Mr. Fisher. Plants were 
pulled up and examined on July 14th, 16th, 20th, 23d and August 
3d. The plants had, as usual, a very marked difference in favor 
of the treatment, and a difference was noted throughout the count- 
