SCIENTIFIC AMUSEMENTS. 



are employed frequently of enormous size, but acting in just the 

 same way, the vapour evolved being condensed in large worm tubes, 

 cooled by being placed in a tank of water. Fig. 25 represents such 



Fig. 24. Flask and Condenser. 



Fig. 25. Still and Worm. 



an apparatus, an intermediate vessel being placed between the 

 still and worm to catch any liquid that may spirt or froth over. 

 In all these cases any solid saline matter previously dissolved in 



