Production of Butter. 



27 



B. The morning's milk amounted to 4 quarts = GO '32 lbs, ; specific gravity, 

 1-032. 



19 '641 grammes yieklcd- 



Casein 

 Butter 

 Sugar 

 Ashes 

 Water 



0-535 

 0-978 

 0-991 

 0-116 

 17-021 



la 100 parts. 



2-7 



4- 9 



5- 0 

 0-5 



8G-9 



19-641 



100-0 



5th day. A. The cow kept as before, consumed 14 lbs. of hay, and 30 lbs. 

 of potatoes (steamed), she gave in the evening 6i quarts of milk=13- 18 lbs. ; 

 specific gravity, 1-030. 



18' 141 grammes yielded — 



Casein 

 Butter 

 Sugar 

 Ashes 

 Water 



0-716 

 0-845 

 0-713 

 0-099 

 15-768 



In 100 parts 



3- 9 



4- 6 

 3-9 

 0-5 



87-1 



18-141 



100-0 



B. The morning's milk amounted to 4| quarts = 12-20 lbs. ; specific gravity, 

 1-030. 



16-740 grammes yielded 



Casein 

 Butter 

 Sugar 

 Ashes 

 Water 



16-740 100-0 



Dumas, in an announcement to the French Academy, advcincecl 

 the theory that the fat ol animals is wholly derived from the 

 fatty matter contained in their food. As the theory of the for- 

 mation of fat is of the first importance in dairy-farming, Dr. 

 Play fair makes the following just observations with reference to 

 the preceding experiments : — 



1. On the second day the cow received 28 lbs. of hay, vv'hich contained 0-46 

 lbs. of fat, and 2-^- lbs. of oatmeal, containing 0-050 lbs. of the same constituent. 

 The cow produced (calculating according to its specific gravity) about 19 lbs. 

 of milk, in which were 0-969 lbs. of butter. But the food altogether contained 

 only 0*486 lbs. of fat, so that 0*483 lbs. of butter must have been produced 

 from other sources. 



2. The food received by the cow on the 3rd day consisted of 28 lbs. of hay, 

 2J lbs. of oatmeal, and 8 lbs. of bean-flour. 



In 100 parts. 



0-600 . . 3-5 



0-835 . . 4-9 



0*648 . . 3-8 



0-082 . . 0-5 



. 14-575 . . 87-3 



