OCTOBEK 24, 1919] 



SCIENCE 



397 



at the most vital procedure — viz., the allot- 

 ment of grants — will sufficiently indicate. If 

 some of the accessories have a different ap- 

 pearance, surely allowance may be made for 

 the disturbance caused by the greatest war in 

 history? — H. H. Turner, General Secretary 

 of the British Association, in the London 

 Times. 



SPECIAL ARTICLES 



THE BOURDILLON WATER STILL 



Those who wish to obtain an abundant 

 supply of " conductivity " water may be inter- 

 ested in a distilling apparatus which has been 

 in use in this and other departments of the 

 University of Wisconsin for the past few 

 years. This still was originally described by 



EXPLANATION OP FIGURES 



Fig. 1. Steam Generator and Boiler. A, boiler, 

 15-liter capacity, copper; A', dash plate; B, trap 

 with removable lid, copper; C, lead to condenser, 

 J-inch diameter, block tin; D, condenser-tube, 6 feet 

 long, 1 inch inside diameter, block tin; D , outlet 

 for escaping gases, block tin; D", outlet for con- 

 densed water, block tin; E, inlet for washed air, 

 block tin ; F, soda-lime toiver and H^SO, in pumice 

 tower (the figure shows but one jar) ; F', outlet to 

 out-of-doors; G, upper condenser jacket, 12 inches 



isa- 



long, 4 inches diameter, copper ; H, lower condenser 

 jacket, 18 inches long, 4 inches diameter, copper; 

 I, rubber connection serving as expansion joint. 



Fig. 2. Air Pump and Wash Train J, as- 

 pirator; J', air inlet from out-of-doors; J", water 

 and air outlet of aspirator sealed into top of jar; 

 K, pressure jar; K', water outlet of pressure jar 

 K; K", air outlet of pressure jar K; L, wash jar 

 containing commercial H.SO,; M,M, soda-lime 

 towers; N, dust filter of cotton-wool; 0, washed air 

 outlet connecting with E of Fig. 1, 



