SI 



7. An alcohometer (Tralles) for testing the alcohol. 



8. A tested lactobutyrometer with stopper. 



9. Pipettes for alcohol of 90 to 92° Tralles, and ether, discharg- 

 ing 10 c.c. or 5 c.c. when blown out. 



10. Pipettes for milk adjusted to give 10 c.c. or 5 c.c. between 

 two marks or divisions. 



The whole lactobutyrometric apparatus is generally for sale 

 put up in a case. (See below " Utensils.") 



The principle of the lactobutyrometer is based upon the obser- 

 vation, that alcohol separates from milk which has been mixed 

 with ether, an etheric fat solution, the volume of which stands in 

 an intimate relation to the quantity of fat dissolved in the ether. 

 The method and apparatus were invented by Marchand, and the 

 latter was called by him the lactobutyrometer. 



The lactobutyrometer is a tube of equal width throughout 

 (10 to 12 m.m.), closed at one end. From this point on the lacto- 

 butyrometer is divided into three equal parts, each being 10 c.c. 

 or 5 c.c. A space equal to about 1 of these parts must remain to 

 allow the contents to be well mixed by shaking. The space be- 

 tween the two upper marks is subdivided into ts c.c. 



While the lactobutyrometer may he used by the inspectors, its 

 results should always he verified hy actual analysis, when a case 

 is to he brought before the courts. 



7« 



LactobutjTTometer. 



