HEMP HIJEDS AS PAPER-MAKING MATEPJAL. 19 



sible to know in advance how the properly treated material should 

 appear. A washing of one hour was given while the roll was lowered 

 from a light to a medium brush, after which the stock was bleached 

 with 17.1 per cent of bleach without the aid of acid. Since sulphite 

 stock improved the previous paper, this bleached stock was used 

 in a furnish of 16.6 per cent sulphite and 83.4 per cent hurds, loaded 

 with 16.7 per cent clay, sized with 1.4 per cent resin size, given a 

 medium brush of two hours, tinted, and run on to the machine at 

 70 feet per minute. The Jordan refiner seemed to have little effect 

 in reducing shives and was therefore left "just off." No trouble was 

 experienced with the stock on the machine, and the sheet is an 

 improvement over previous samples. 



Run No. 140 was made from cooks Nos. 306 and 307, in which 

 more caustic soda was employed than in any previous cooks and at a 

 higher concentration, the fiber yields of which averaged 37.3 per cent 

 of the unsieved hurds. Not much improvement was apparent in 

 the cooked stock, in spite of the increased severity of cooking. The 

 stock was washed and given a medium brush for one hour, bleached 

 with 11.9 per cent of bleach, assisted with one-half pint of oil of 

 vitriol, and made into a furnish of 14.9 per cent sulphite and 85.1 

 per cent of the hurd stock. After loading with 14.7 per cent of clay 

 and sizing with 1.28 per cent of resin size, the furnish was given two 

 hours' medium brush, tinted, and run on to the paper machme at 

 70 feet per minute. Again the Jordan refiner did not seem to reduce 

 the wood shives sufficiently, and it was left "just off." No trouble 

 which could be attributed to the stock was experienced on the paper 

 machine. The color of the resulting paper is due to the use of too 

 httle blue in tinting and probably in some measure to the use of too 

 low a percentage of bleach. 



Run No. 141 was made from the stock of cooks Nos. 308 and 309 

 in practically the same manner as run No. 140. The stock was 

 washed and brushed one hour, bleached (the record of the amount 

 of bleach was lost), made into a furnish of 14.7 per cent of sulphite 

 and 85.3 per cent of hurd stock, loaded with 14.9 per cent of clay, 

 sized with 1.26 per cent of resin size, given one hour at a medium 

 brush, tinted, and run on to the machine. The Jordan refiner was 

 able to reduce the wood shives to a somewhat greater degree than in 

 previous runs and was held at a medium brush. The stock acted 

 well on the machine and produced a sheet of better quality than any 

 preceding, with the exception of the color, which was due to using too 

 small a quantity of blue. 



Among the cooks made for run No, 142 are Nos. 312 and 313, in 

 which the concentration of the caustic soda was raised to 113 and 

 116 grams per liter and the percentage employed was also increased. 

 In spite of these increases the stock from these two oooks did not 



