CONTENTS/ 5 



Department Bulletin No. 660 — Highway Cost Keeping — Continued. 



Part II. — Cost keeping for highway work: Vago. 



Essentials of a cost system 13 



Classification of expenditures 13 



Operation code 16 



Method of obtaining class and operation number from code 17 



Use of code in operations 18 



Detail of cost accounts and necessary codes 19 



Recording forms 23 



Immediate use of cost data 30 



Final disposition of cost data 30 



Definitions of operation terms 39 



Appendix 42 



Department Bulletin No. 661. — The Manufacture of Casein from But- 

 termilk or Skim Milk: 



Importance of casein manufacture to creameries 1 



The manufacture of casein from buttermilk 2 



Directions for manufacturing casein from buttermilk 4 



Yield of buttermilk casein 8 



Cost of manufacture 8 



Equipment required 9 



Factors influencing quality 17 



The manufacture of skim-milk casein 22 



Sulphuric-acid method 22 



Pressed-curd method 23 



Cooked-curd method 23 



Ejector method 24 



Comparison of the different methods of making skim-milk casein 25 



Yield of skim-milk casein 26 



Requirements for good casein 26 



Methods of determining quality of casein 28 



Adhesive or strength test 30 



Solubility tests 31 



Casein markets and prices 31 



Department Bulletin No. 662. — Vesicular Stomatitis of Horses and 

 Cattle: 



History and characteristics 1 



Etiology 3 



Symptoms and lesions * 4 



Contagiousness 5 



Differential diagnosis 



Treatment 9 



Department Bulletin No. 663. — The Installation and Equipment of 

 an Egg-breaking Plant: 



Purpose of the investigation 1 



Construction and arrangement of rooms 2 



Equipment of breaking and sterilizing rooms 7 



Conclusions 24 



Department Bulletin No. 664. — The Prevention of Breakage of Eggs 

 in. Transit when Shipped in Carlots: 



Reason for the investigation 1 



Amount of damage to eggs during marketing 2 



Progress of the investigation: 



General plan 3 



Conditions at point of origin 3 



Stowing the load 5 



The railroad haul 9 



Conditions at the terminal 10 



Results of the investigation : 



Factors contributing to transit damage 12 



Summary 30 



