ANALYTICAL PROCESSES. 



string (previously boiled with 

 water containing sodium car- 

 bonate to remove size and res- 

 inous matters) which serves to 

 prevent contact between the con- 

 centric folds of the coil, and is 

 conveniently passed through 

 holes in the paper. A cap of 

 filter paper is then placed over 

 one end of the coil and secured 

 l>y the ends of the string/ The 

 coil is then suspended by some 

 simple means, the capped end 

 being downward, and 5 c. c. of 

 the milk to be tested, run on to the upper part from a 

 pipette. The milk is rapidly absorbed by the paper 

 and none filters through the cap. It is then dried in a 

 water oven for an hour or two. 



Sour milk must be weighed and thinned with a few 

 drops of ammonium hydroxid before absorption by the 

 paper. 



Heavy filter paper of good quality, which yields to 

 ether only a milligram or less, may also be employed, 

 as suggested by Thomson. One end of the strip is 

 fastened to some convenient support, and the other be- 

 tween the fingers. The paper being kept horizontal, 

 5 c.c. of the milk are taken in a pipette, and distributed 

 evenly over it, the end of the pipette being wiped on a 

 part left dry for the purpose. It is dried by passing to 



