definite progress is being made in the 

 development of a recovery system to 

 return the used chemicals cheaply. This 

 step is necessary to the general adopt- 

 tion of the new bases. Its successful 

 accomplishment will be of immense pub- 

 4ttic benefit by making possible the elimi- 

 ^mation of sulphite waste-liquor dis- 

 charges, which at present are a major 

 source of stream pollution. 



Pulp refinement 

 and paper making 



The utility of a given wood species 

 for paper production is not determined 

 by its pulping behavior alone but by 



the possibilities of adapting the pulp 

 to the varied requirements of paper 

 making. Laboratory research is there- 

 fore intimately concerned with all the 

 other manipulations involved — bleach- 

 ing, beating, refining, paper-machine 

 operations, and finally the testing of the 

 finished product and the salvaging of 

 waste fiber and chemicals. Many tasks 

 lie ahead, as for instance the correla- 

 tion of fiber properties with intensity 

 of beating, the improvement of multi- 

 stage bleaching processes, and the analy- 

 sis of some 30 machine variables in 

 relation to the strength, finish, inking 

 quality, glare, and moisture resistance 

 of the finished paper. 



How 



TO USE THE LABORATORY 



All the information that the Forest 

 Products Laboratory has gained through 

 years of research is available to the 

 public. Every year thousands of in- 

 quiries are answered by letter and 

 problems are discussed with those who 

 come to the Laboratory seeking advice 

 on problems of wood utilization. 



In cases where the problem presented 

 is of such scope and difficulty as to 

 warrant a cooperative research project, 

 the work will be undertaken if consistent 

 with the Laboratory's public objectives 

 and subject to advance agreement as to 

 fcnethods and payment of costs. The 

 Laboratory's guiding purpose in such 



studies is to secure facts that will pro- 

 mote the best use of wood. A pamphlet 

 explaining the cooperative service more 

 fully is obtainable on request. 



Laboratory publications are available 

 covering the main findings of its re- 

 search work, and classified mailing lists 

 are maintained for the distribution of 

 current information in different fields 

 of wood use. General visitors are con- 

 ducted through the Laboratory at 

 regular hours. 



Inquiries should be addressed to the 

 Director, Forest Products Laboratory, 

 Madison, Wis. 



WISE TIMBER USE IS THE 

 BEST TIMBER CONSERVATOR 



33 



