GROUND-WOOD PULP. 57 
quick-cook sulphite and 80 per cent of ground wood. ‘The complete 
list of material furnished the beaters is given in Table 2. 
The quantities of the different colors added varied with the color 
of the pulp. In every case attempt was made to duplicate the 
standard news color used by the company manufacturing the paper. 
It is very probable that if the sheets had been left uncolored, or had 
Fic. 44.—Black gum (Nyssa sylvatica). 
been colored a cream white, they would have presented a better 
appearance than they did. ‘ 
Of the first series of 12 tests, those on white spruce, balsam fir, and 
Sitka spruce were run on a Fourdrinier paper machine trimming 109 
inches wide and having a jacketed upper couch roll. On account of 
the slowness of the stock and insufficient suction the operation of the 
pulps in these three tests was somewhat unsatisfactory. There was 
sticking of the pulp to the couch and difficulty in securing good forma- 
tion. 
