94 



Analysis of Feeding Materials 



[140 



this tube, and e is thus completely [emptied of liquid, A 

 convenient receptacle is affixed to n, in which the liquid may 

 be heated and the ether vaporised. The vapour passes up 

 the tube /, and after being condensed in a condenser above, 

 falls back upon the substance until the level of the syphon 

 top is again reached, when the operation will repeat auto- 

 matically. The other extractors figured are exactly the same 

 in principle, but slightly different in construction. 



Fig. 38. 



The apparatus, fully fitted up, is shown in fig. 38. 



The Soxhlet extractor, s, is fitted at the top to a condenser, 

 C, and below to a small round flask, f. The corks a, a are 

 carefully selected for their soundness, and extracted with ether. 

 The flask f just dips beneath the surface of the water in the 

 bath a. For this bath any tin of convenient size may be 



