CONTENTS. V 



Dbpartment Bulletin No. 55. — Balsam Fir, Page. 



Introduction 1 



Distribution of balsam fir 2 



Forest types 4 



Present stand and cut 7 



New York 9 



New Hampshire 9 



Vermont 10 



Wisconsin 10 



Minnesota 11 



Michigan 11 



Economic importance 11 



Lumbering balsam fir 16 



Life history of balsam fir 22 



Growth 32 



Yield 57 



Management 60 



Summary 67 



Bibliography 68 



Department Bulletin No. 56. — ^A Special Flask for the Rapid Determi- 

 nation OF Water in Flour and Meal. 



Introduction 1 



Description of the special flask 2 



How to make a water test of flour or meal 2 



Specifications for the thermometer 3 



Adjustment of the thermometer 3 



Description of the graduate and how to read it 3 



Oil used in making the test 4 



Stoppers to be used 5 



How to test different substances 5 



Time of test 5 



Method of finding the proper temperature 6 



Points to remember 6 



Dbpartment Bulletin No. 57. — ^Water Supply, Plumbing, and Sewage 

 Disposal for Country Homes. 



Introduction 1 



The farm water supply 1 



Surface supplies 2 



Underground supplies 6 



Pumping, storage, and distribution of water 13 



Plumbing 31 



Water plumbing 31 



Sewer plumbing 32 



Sewage purification and disposal 33 



Preliminary or septic-tank treatment 33 



Final treatment 34 



Double-chamber septic-tank systems 35 



The automatic siphon 39 



The final disposal system 40 



Single-chamber tank systems 43 



The grease trap 44 



Suggestion on operation 45 



Conclusion 45 



