248 



BUTTER ANALYSIS. 



Being lighter than the fluid in which it occurs, the 

 tendency of each globule is to seek the surface. The 

 butter which we are striving to obtain is the pure fat 

 of these globules, as free from foreign matter as may 

 be, although in practice we find other substances in 

 butter, as below : — 



Let us see ^vhat would be the effect on mixing 

 artificially, different sized bodies in water, and then, 

 after well shaking, leaving the vessel containing the 

 lot at rest. We will use sand for an illustration, 

 because the principles being the same which underlie 

 the process of acquiring an equilibrium, whether of 

 lighter or heavier material, we have in this substance 

 a handy one to study, and our conclusions can be 

 readily verified. 



EXPERIMENTS WITH SAND. 



Suppose a handful of sand, of widely different 

 sizes, to be violently shaken or stirred in a shallow, 

 and also in a deep dish of water. What effect will 



1- Quoted in Trans. Vt. Datrymen'B AssociatioD, 1872, p. 150. 



" On Food of Animate, p. 63. 



" Journ. 14. A. 8., xi. p. 735. 



" Scjilded Cream, Devonshire raethod, Journ. R. A. S. ll, p. 735, 



10 Wagner's Handbook of Chem. Tech. p. 669. 



