FOR NEW HAMPSHIRE FARMERS 



149 



The outfit consists of a pipette (Fig. 1) for measuriug the 

 milk sample. (Figures 2 aud 3 show undesirable forms of 

 pipettes.) A small jar (Fig. 4) for measuriug the acid, and 



Fig. 6. 



Fig. 7. 



a special bottle or test tube with graduated neck, illustrated in 

 Fig. 5, aud a machine (Figs. 6 and 7) so constructed that the 

 bottles and contents can be enclosed and whirled at a high 

 speed. 



TAKING THE SAMPLE 



The pipette is graduated to hold exactly 17.6 cubic centi- 

 meters of milk, and when well drained will deliver 17.5 cubic 

 centimeters in the test bottle. No test of any kind can be 

 of value unless one first obtains a perfectly fair sample. 

 Under some circumstances it may be difficult to get a fair 

 sample of milk. On the farm, however, there need be no 

 difficulty, but if one has some kuowledge regarding the nature 

 of milk, success will be more certain. Butter fat is found in 

 milk in small particles, or globules (Fig. 8). These globules 

 are so small that they can be seen only b}'^ the aid of a power- 

 ful microscope. The first milk drawn from the udder of a 

 cow contains comparatively few fatty globules, while that milk 

 which is obtained by " stripping" is exceedingly rich in fat. 

 It will be seen that a fair and accurate sample for testing can 

 be obtained only after the milk has been complete^ removed 



