20 
BULLETIN 404, U. S. DEPART MENT OF AGRICULTURE . 
show any appreciable improvement when dumped from the rotary. 
Stock from cooks Nos. 310, 311, and 312 was given a medium brush 
and washing of one hour, bleached with 10.95 per cent of bleach, 
made into a furnish consisting of 15.2 per cent of sulphite and 84.8 
per cent of hurd stock, loaded with 15.2 per cent of clay, sized with 
1.28 per cent of resin size, given a medium brush for one hour, tinted, 
and pumped to the stock chest. Stock from cooks Nos. 313 and 314 
was treated in exactly the same manner, except that 11.4 per cent 
of bleach was used. It was pumped to the stock chest and mixed 
with the furnished stock from cooks Nos. 310, 311, and 312. A 
medium Jordan brush was given the stock and it acted well on the 
paper machine, which was speeded to 75 feet per minute. There 
seems to be a tendency in the hurd stock to crush a little at the 
" dandy roll," and although the marks are not removed by the calen- 
der stack which was employed in those tests it was found that one 
"nip" on the supercalenders renders them practically imperceptible 
and it is believed that the proper size and weight of calender stack 
would entirely remove these marks. All of the papers produced 
up to this point are somewhat lacking in the bulk desired in a book 
paper; therefore, in the two following runs soda-poplar stock was 
included in the furnishes. 
In run No. 143 stock from cooks Nos. 315 and 316 was given a 
medium brush and washing for one hour and was medium brushed 
for one hour more, bleached with 11.3 per cent of bleach assisted 
with one-half pint of oil of vitriol, made into a furnish of 16.5 per 
cent of sulphite, 22.3 per cent of soda poplar, and 61.2 per cent of 
hurd stock, loaded with 22 per cent of clay, sized with 1.38 per cent 
of resin size, given a hard brush for one hour, tinted very strongly, 
and pumped to the stock chest. This stock was beaten to a greater 
extent than in previous runs. The stock was run on the paper 
machine at a speed of 75 feet per minute, using a medium Jordan 
brush, and no trouble whatsoever was experienced. Not over 2 
pounds of "broke" was produced during the whole run, and that 
was in the "threading" of the machine. The color of the sheet is 
entirely satisfactory for many uses. The wood shives apparently 
were reduced to a satisfactory degree. Experienced paper makers 
commented very favorably on the running of this furnish and the 
quality of the paper produced. 
Run No. 144 was intended as a duplicate of run No. 143. Stock 
from cooks Nos. 317 and 318 was given a medium brush and washing 
for one hour and a further medium brush of one hour, bleached with 
11.4 per cent of bleach, and made into a furnish composed of 15.5 
per cent of sulphite, 23.5 per cent of soda poplar, and 61 per cent of 
hurd stock, loaded with 21.4 per cent of clay, sized with 1.17 per cent 
of resin size, hard brushed for one hour, tinted by the expert colorer 
