﻿88 



RICHMOND. 



Remarks. — The conditions of experiment 3, namely, a 5 per cent 

 (6° to 7° Baume) liquor and five hours' digestion at 7 to 8 atmospheres' 

 (105 to 120 pounds) pressure produced a well-boiled pulp, comparatively 

 free from screenings. In experiment 4, a weaker liquor accomplished 

 the same result in double the time, at a slightly increased pressure. 

 Experiment 5 produced a coarse pulp, very brown and badly contaminated 

 with shive. Experiment 1 showed evidence of too caustic a treatment. 



Table No. 6. — Experiments with cupang. 



Exper- 

 iment 

 No. 



Caustic 



soda 

 solution. 



Caustic 

 soda cal- 

 culated on 

 weight of 

 material. 



Duration 



of di- 

 gestion. 



Pressures. 

 carried. 



Yield of pulp. 



Bleaching 

 powder 



con- 

 sumed. 



Loss of 

 weight in 

 bleach- 

 ing. 



Un- 

 bleached. 



Bleached. 



1 

 2 

 3 

 4 

 5 



Per cent. 

 7.5 

 6 



4.7 



' 3.75 



3.5 



Per cent. 

 25 

 20 

 20 

 15 

 12.5 



Hours. 

 8 

 10 

 8 

 8 

 8 



Atmospheres. 



7 



6 



7 



6-8 



6-8 



Per cent. 

 41.91 

 43.71 

 44.97 

 48.4 

 50.4 



Per cent. 



Per cent. 



Per cent. 



40.3 

 40.2 



16.5 

 18.4 



7.8 

 10.6 















Remarks.— Under similar conditions of treatment, cupang pulps more 

 easily than lauan and with a little better yield. The pulp resembles 

 poplar, in length of fiber and ease of treatment although it is somewhat 

 harder to bleach. 



Table No. 7. — Experiments with mayapis. 



Exper- 

 iment 

 No. 



Caustic 



soda 

 solution. 



Caustic 

 soda cal- 

 culated on 

 weight of 

 material. 



Duration 



of di- 

 gestion. 



Pressures 

 carried. 



Yield of pulp. 



Bleaching 

 powder 



con- 

 sumed. 



Loss of 

 weight in 

 bleach- 

 ing. 



Un- 

 bleached. 



Bleached. 



1 



2" 

 3» 

 4 



Per cent. 

 10 



6.25 

 5 

 4 



Per cent. 

 22 

 20 

 20 

 17.5 



Hours. 



5-6 



10 



5 



5 



Atmospheres. 

 5 



6-7 

 6-7 

 6-7 



Per cent. 

 38.5 

 41.85 

 42.5 

 44 



Per cent. 



Per cent. 



Per cent. 



40.7 



41 



41.19 



9.9 

 12 

 15.4 



2.74 

 3.53 

 2.81 



"Good white color. 



'» Yellowish color. 



Remarks.- — Mayapis is one of the most promosing of the Philippine 

 pulp woods. It is even lighter in color than white lauan and has a con- 

 siderably longer fiber than cupang. A yield of 40 to 45 per cent of easily 

 bleached pulp may be expected by digestion with alkaline liquors. 



Dita wood is too short fibered and weak to be of much value for paper 

 pulp. It is briefly considered here because of its wide distribution and 

 abundance in the Philippines and because it would yield the bark which 



