87 
obtained during the process, the following table of results was 
accordingly prepared : — 
Reactions. 
I 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
Caustic Soda (per 
cent. NaOH) 
Sulphite Liquor 
S 0 d a, S a 1 1 
equiva lent 
(Na SO per 
n 2 3 
ce n t) 
10 
10 
12 
16 
1 SYz 
15 
16 
t-t 
00 
14 
• 
* ’ 
■ 
Sodium Sulphite 
and Caustic 
Soda (total 
percent) 
12 
16 
Pressure in “ at- 
mospheres ” . . 
2Yz2y 2 5 
3 
3 
5 
2 
2 12 
2 H 
7 
2 ^ 
2 V 2 
2V2 
2 
2 y 2 
Time in 
“ hours ” 
8 
12 
■ 
10 
12 
6V2 
7 
6 
7 
9 
sy 2 
7 
7Yi 
12 
8 
OBSERVATIONS, 
No. I. Under-boiled. 
„ 2 . Over-boiled. 
„ 3- 
„ 4. Unsatisfactory yield of pulp. 
5. Fair conditions. 
6. „ Readily bleached. 
7. Good conditions and yield. 
„ 8. Best general results. 
9. Good pulp. Considerable loss in yield. 
10. Fair condition. Imperfectly resolved. 
11. Improved strength of fibre. 
„ 12 . 
13. Fair pulp, not readily bleached. 
[4. Good results. 
The conversion of the grass into pulp in the digester in the case 
of boils exceeding 9 hours, duration was usually accompanied by a 
considerable loss in the ultimate yield, and many difficulties presented 
themselves in the course of the first experiments. 
From the above series of trials upon a practical scale the pro- 
portions of caustic soda and general conditions as employed during 
the boil “ No. 14 ” were considered the most desirable for the purpose 
of producing good average fibre, at a reasonable expenditure o 
chemicals. 
