62 BULLETIN 1485, U. S. DEPARTMENT OF AGRICULTURE 
By Sulphite Process 
Reduces readily. 
Unbleached pulp: Specky; rather difficult to bleach. 
Yields: 40 to 45 per cent. 
Bleach required: 15 to 20 per cent. 
By Soda Process 
Reduces readily. 
Unbleached pulp: Very difficult to bleach. 
Yields: 30 to 35 per cent. 
Bleach required: More than 35 per cent. 21 
By Mechanical Process 
Not determined. 
Black Locust (Robinia pseudoacacia) 
Other names in use. — Locust and yellow locust. 
Range. — From Pennsylvania to northern Georgia, also southern Illinois and 
southwestern Indiana. Widely naturalized through cultivation and other 
agencies throughout the United States east of the Rocky Mountains. 
Oven-dry weight per cubic foot, green volume. — 41 pounds. 
Fiber length. — 
By Sulphite Process 
Reduces with difficulty and very unevenly. 
Unbleached pulp: Not satisfactory. 
By Soda Process 
Reduces fairly readily. 
Unbleached pulp: Does not bleach satisfactorily. 
Yields: 40 to 45 per cent. 
By Mechanical Process 
Not determined. 
Ailanthus (Ailanthus altissima, formerly a. glandulosa) 
Other names in use. — Tree of Heaven and Chinese sumac. 
Range. — Native of China; but has been widely naturalized in the eastern 
United States. 
Oven-dry weight per cubic foot, green volume. — 24 pounds. 
Fiber length. — 1.2 mm. 
By Sulphite Process 
Not determined. 
By Soda Process 
Reduces readily. 
Unbleached pulp: Very easy to bleach. 
Yields: 45 to 50 per cent. 
Bleach required: 5 to 10 per cent. 
By Mechanical Process 
Not determined. 
7. MISCELLANEOUS SPECIES 
Soap weed (Yucca elata, formerly Y. radiosa) 
Other names in use. — Spanish bayonet and Spanish dagger. 
Range. — Southwestern Texas to southern Arizona; northern Mexico. 
Oven-dry weight per cubic joot, green volume.— 18 pounds. 
Fiber length. — _ 
Sulphite Pulp 
Not determined. 
Soda Pulp 
Soapweed is readily reduced by the soda process, yielding a pulp containing 
20 to 30 per cent of rather short fibers. The remainder is pithy material, the 
21 Bleach requirement greatly reduced when cooked by sulphate process. 
