blue, given one hour's light brush, and pumped to the stock chest. When
running it on the paper machine, the Jordan refiner seemed to have
little effect in reducing shives of undertreated wood, which indicated
further the necessity of harder cooking. The furnish acted well on the
paper machine at 70 feet per minute, but appeared somewhat too "free" on
the wire. The paper produced from this test is of very low quality, due
to the improper preparation of the stock, lack of sufficient bleach, the
use of too small an amount of blue tinting, and the presence of an
excessive amount of dirt, sand, and shives. The excessive amount of dirt
and sand suggested the sieving of the hurds before cooking, and this was
performed in all subsequent cooks.

The finish of the sheet is very poor, due to the fact that the calender
stack was composed of very light rolls which did not have a satisfactory
surface, yet the stack is known to be able to produce better finishes if
the proper stock is employed.

Run No. 136 was made on the 300-pound portion of stock from cooks Nos.
293, 294, 295, and 296, and in essentially the same manner as run No.
135. The stock was washed one hour, but given a brush of three hours,
and this brush was harder than in run No. 135. Bleach to the extent of
19.8 per cent of the fiber was used, assisted by 1 pint of oil of
vitriol, and the resulting color was an improvement over that of run No.
135. After adding 13.5 per cent of clay and sizing with 1.1 per cent of
resin size, the furnish was given one-half hour's light brush, tinted,
and run on the machine, which was set at 70 feet per minute. This stock
acted better on the wire and gave no trouble on the machine, but it
still seemed to be impossible to reduce the wood shives by manipulation
of the Jordan refiner. The resulting sheet is an improvement over that
produced by No. 135, but is far from satisfactory.

Run No. 138 was made from hurds which, as in all subsequent tests, were
sieved on a 11-1/2-mesh wire screen until practically all the loose dirt
and sand was removed, which operation caused a loss averaging 3 per cent
of the hurds. Stock from cooks Nos. 302 and 303 was used for this run
and the increased amount of caustic soda and the increase in the time of
cooking gave a stock of better appearance than those of preceding tests.

The stock, amounting to 231 pounds dry weight, was washed and at the
same time given a light brush for one hour only, after whic