ACKNOWLEDGMENTS 
Except for the cooperation of the pulp and paper manu- 
facturers, who provided funds and generously assisted in 
furnishing mill data and material, this study would not 
have been possible. The writers are doubly indebted to 
the mills which made available their plant facilities for 
giving practical commercial tests to laboratory data which 
needed to be subjected to practical test before they could 
be indorsed fully. 
The following companies cooperated in the study: 
Beaver Board Co., Buffalo, N. Y.; Consolidated Water 
Power & Paper Co., Wisconsin Rapids, Wis.; Dells Paper 
& Pulp Co., Eau Claire, Wis.; Dexter Sulphite Pulp & 
Paper Co., Dexter, N. Y.; Dill & Collins, Philadelphia, 
Pa.; Eastern Manufacturing Co., Bangor, Me.; Falls Manu- 
facturing Co., Oconto Falls, Wis.; Finch, Pruyn & Co., 
Glens Falls, N. Y.; Flambeau Paper Co., Park Falls, Wis.; 
Fort Orange Paper Co., Castleton, N. Y.; Grandfather 
Falls Co., Merrill, Wis.; Hammermill Paper Co., Erie, Pa.; 
Kimberly-Clark Co., Neenah, Wis.; Marathon Paper Mills 
Co., Rothschild, Wis.; Marinette & Menominee Paper Co., 
Marinette, Wis.; Minnesota & Ontario Paper Co., Inter- 
national Falls, Minn.; Nekoosa-Edwards Paper Co., Port 
Edwards, Wis.; Newton Falls Paper Co., Newton Falls, 
N. Y.; New York & Pennsylvania Co., Johnsonburg, Pa.; 
Northern Paper Mills, Green Bay, Wis.; Northwest Paper 
Co., Cloquet, Minn.; Patten Paper Co., Appleton, Wis.; 
Pejepscot Paper Co., New York, N. Y.; Port Huron Sul- 
phite & Paper Co., Port Huron, Mich.; Racquette River 
Paper Co., Potsdam, N. Y.; Rhinelander Paper Co., Rhine- 
lander, Wis.; Thilmany Pulp & Paper Co., Kaukauna, 
Wis.; Tidewater Paper Mills Co., Brooklyn, N. Y.; S. D. 
Warren Co., Boston, Mass.; Watab Paper Co., Sartell, 
Minn.; Wausau Paper Mills Co., Brokaw, Wis.; Wisconsin 
River Paper & Pulp Co., Neenah, Wis.; York Haven Paper 
Co., York Haven, Pa. 
Acknowledgment is also made of the cooperation of the 
Newsprint Service Bureau, the American Paper and Pulp 
Association, the Canadian Pulp and Paper Association, 
and the Technical Association of the Pulp and Paper 
Industry, in the continuance of investigations to which 
there is occasional reference in this report. 
The writers are especially indebted to John D. Rue, in 
charge of the section of pulp and paper, Forest Products 
Laboratory, for helpful comments and assistance. 
