THE SUITABILITY OF AMERICAN WOODS FOR PAPER PULP 51 
By Soda Process 
Reduces readily. 
Unbleached pulp: Bleaches with difficulty. 
Yields: 40 to 45 per cent. 
Bleach required: 25 to 30 per cent. 
By Mechanical Process 
Behavior probably similar to that of aspen. 
Red Alder (Alnus rubra) 
Other names in use. — Alder and western alder. 
Range. — From southeastern Alaska to southern California. 
Oven-dry weight per cubic foot, green volume. — 23 pounds. 
Fiber length. — 1.2 mm. 
By Sulphite Process 
Not determined. 
By Soda' Process 
Reduces readily. 
Unbleached pulp: Fairly easy to bleach. 
Yields: 40 to 45 per cent. 
Bleach required: 20 to 25 per cent. 11 
Red alder is much more susceptible to decay than ordinary pulp woods. 
By Mechanical Process 
Behavior probably similar to that of aspen. 
Balsa (Ochroma lagopus) 
Other names in use. — Balsa and balsa wood are the English and the commoner 
trade names for the wood. Common native names are lanero and lanillo in 
Cuba, bombast mahoe in Jamaica, and guano in Spanish Honduras. 
Range. — Tropical America, Cuba, Jamaica, and Porto Rico. 
Oven-dry weight per cubic foot, green volume. — 7 pounds. 
Fiber length. — 1.33 mm. 
By Sulphite Process 
Not determined. 
By Sulphate ^Process 
Reduces readily. 
Unbleached pulp: Fairly easily bleached. 
Yield: 55 to 60 per cent. The lightness of the wood makes the yield on the 
volume basis extremely low. 
Bleach required: 25 to 30 per cent. 
Uses to which pulp is suited: Balsa is probably of no commercial value as a 
pulp wood because of the extremely low yield per unit of volume. 
By Mechanical Process 
Not determined. 
Box Elder {Acer negundo) 
Other names in use. — Ash-leaved maple and three-leaved maple. 
Range. — From central New York and western New England, southward to 
central Florida; westward to Minnesota, Iowa, eastern Kansas, Missouri, 
southeastern Oklahoma, and southwestern Arkansas, northern Alabama, west- 
ern Louisiana, and eastern Texas. 
Oven-dry weight per cubic foot, green volume. — 30 pounds. 
Fiber length . — 
By Sulphite Process 
Behavior probably similar to that of red maple. 
11 About 15 to 20 per cent when cooked by sulphate process to yields stated. 
