LACTOMETRY. 



2D3 



by filtration. The filtrate or whey is poured into a cylinder 

 graduated into divisions of a fifth of a cubic centimeter, and 

 thence added, dropwise, to 20 cub. centimeters of the test- 

 liquid, until the disappearance of its blue color. The number 

 of divisions of whey required to efi'ect this are then to be 

 noted, and the weight of sugar in the 1000 pts. calculated by 

 the rule of three. The liquor must be contained in a glass 

 flask and boiled before and after each addition of whey. 



Yield of Butter. — Reiset instituted a series of experiments 

 to determine the truth of a statement by Peligot, that, during 

 milking, the last portions of milk were richer in solid consti- 

 tuents than the first. He employed two cows, which grazed 

 through the day and were stalled without food through the 

 night. The following tables contain the results. The residues 

 were obtained by evaporating 20 grm. of the milk to dry- 

 ness at 212°. 



