ILLUSTRATIONS 



FIG. HALFTONES PAGE 



1. Alveoli of the Udder in Cross-section g 



2. Cross-section of an Alveolus of the Udder at the Time 



of Parturition g 



3. Involution of the Udder of an Old Cow 3 



4. Extremity of the Milk Cistern 3 



7. Colonies of Coli Aerogenes 54 



8. Colonies of Proteus Vulgaris 54 



21. Internal or Double-tube Cooler 186 



41. Various Types of Dirt Testers 300 



TEXT CUTS 



5. Preparation Showing Streptococcus Lacticus or Bacterium 



Lactis Acidi 53 



6. Preparation from Sediment from a Cow Affected with 



Catarrhal Mastitis 53 



9. Inlet in a Wall Already Constructed; Inlet in a Wall 



Being Built, and an Outlet Shaft with Two Openings. . 132 



10. An Outlet Flue Hinged at the Ceiling 134 



11. Cross-section of Stable Floor 142 



12. Window Arranged to Act as Fresh Air Inlet 147 



13. Open or Uncovered Pail 171 



14. Covered-top Pail with Opening Nearly Horizontal 171 



15. Covered-top Pail with Vertical Opening 172 



16. Another Variety of Covered-top Pail 173 



17. Floor Plan of Conveniently Arranged Milk House 181 



18. Cooler of Conical Type 183 



19. Corrugated Type of Cooler 184 



20. Tubular Cooler, with Continuous Surface 185 



22. Section Showing Relation of Water Table to Surface Irreg- 



ularities 194 



23. How Springs May be Polluted by Subsurface Drainage. . 195 



24. A Pasteurizer of Simple Type 216 



25. Pasteurizer 



fat 



