I9I3] Walter Lewis Croll 5^7 



In the drawing of the apparatus (Plate 7), A indicates a 100 c.c. 

 graduated measuring cylinder with a ground-glass stopper; B is a 

 rubber stopper; C, a glass tube of small bore, which is welded to 

 another tube, D, at the points where it passes through the latter. 

 The lower portion of tube C is beut sharply on its length and the 

 open end is ground. Tube D is enlarged at the top to facihtate the 

 introduction of ether; at its lower end there is a bulb, SB, with small 

 holes in its walls, which allow the ether poured into tube D to spray 

 against the sides of the cylinder, thus washing them. F is a side 

 arm of small-bore tubing welded to D near the Upper end. In 

 forcing out the ethereal Solution of fat, a finger is held over the 

 Upper end, D, and the Operator blows air through F, the Solution 

 being ejected through E into a weighed glass dish. In case it is 

 desired to increase the force of the washing spray, a finger may be 

 placed over the Upper end of D and, by blowing into F (just as 

 when driving out the ethereal Solution of fat), the pressure can be 

 increased as much as may be desired. Before starting to force out 

 the ethereal Solution of fat, the opening of the lower end of tube C 

 is brought on a level with the surface of the protein layer by rais- 

 ing or lowering the entire glass piece through the rubber stopper, 

 B. The shaking is done, of course, with the ground-glass stopper 

 inserted tightly into the cylinder just as when the pipette is used, 

 and, after a few minutes, the stopper is carefully washed with 

 absolute ether and the special apparatus inserted. 



Advantages o£ the modified Meigs method. The improved 

 Meigs method possesses the following advantages over the Soxhlet : 

 (i) The time in weighing out is shortened and the danger of acci- 

 dental loss is diminished, for no absorption of the milk by fat-free 

 material is necessary. (2) Two or three hours are saved, as no 

 drying is required. (3) The extraction requires ten minutes for 

 its execution against three hours as the minimum for the Soxhlet 

 process. (4) The apparatus is simple and inexpensive, while the 

 Soxhlet is neither. 



The advantages over the other processes have already been men- 

 tioned and are even greater than those over the Soxhlet method. 



The Meigs method has been tested against the Soxhlet process 

 on six samples of cow milk, with the aid of the special apparatus 



