washing themselves, their cattle, and their clothes in the same tank from which they draw their drinking-water. By the advice of the medical faculty the hospitals and public offices were supplied with niters, which were cheap and effective. They are still to be seen in every European and Eurasian house.
The filter is formed of three large earthen pots, which are placed upon a stand one above the other. The pot at the top contains sand, the second charcoal, and the lowest is the receptacle for the filtered water after it has percolated through the sand and charcoal. The two upper chatties are pierced with holes to allow the water to drip through into the lowest. But the best plans devised by European skill and science are often upset by the natives, who dislike the trouble involved in carrying them out.
The Duke was greatly interested in the working of the filter, its simplicity and cheapness commending the arrangement to his practical mind. He was visiting a town in the Mofussil, and among other things he inspected the hospital. There he saw a chatty-filter. Stopping before it he asked the medical officer to explain the process. He accordingly described how the water filtered through the sand first, leaving its grosser impurities behind. Passing through the second pot containing the charcoal it was again filtered. The Duke listened attentively and, turning to one of his aides, he said 'Fetch a chair.'
It was brought and his Excellency mounted it. Lifting the lid from the topmost pot he plunged his hand in, while his eagle eye fixed the unfortunate medical officer.
'The pot's empty!' he exclaimed in surprise.
'H'm ! ' was the comment, as the ducal hand explored the depths of the second pot. Again emptiness met his groping fingers.
