108 



ANALYSIS OF MILK. 



difference of the two weights. The coil was transferred to a 

 drying oven at 100° C, and left therein till it ceased to lose 

 weight. The original method was thus available for the deter- 

 mination of total solids as well as of fat. The dry coil was 

 placed in a Soxhlet extractor* (Fig. 8), and the fat separated 

 from the solids not fat by ether. The total extract, after evapor- 

 ation of the ether and drying at 100° C, was regarded as fat. 

 Allen and Chattaway modified this method by rolling up a 



Fig. 8. — Soxhlet Extractor. 



piece of string with the coil, to keep the layers of paper from 

 touching each other ; they also wrapped a piece of filter paper 

 around it, in order that no milk might escape when a weighed 

 quantity was poured thereon. 

 Thompson also modified it by hanging up a strip by one end 



* The Soxhlet extractor was really devised by Szombathy ; it was 

 described by Soxhlet, and due credit was given by him to the inventor. 

 The apparatus is, however, always known by Soxhlet's name. 



