SYSTEM OF IRRIGATION. 153 



rally constructed from the trunk of a mango tree, 

 is about nine cubits long, and in shape somewhat 

 resembles a canoe. One end is lowered and raised 

 alternately by two men ; to assist them in raising 

 again the end which has been lowered into the 

 water, a rope is attached to it and to the end of a 

 beam, which is elevated and balanced on a forked 

 stake ; to the further end of this beam a quantity of 

 earth is suspended, and by weighing it down, raises 

 the end to which the extremity of the doonee is at- 

 tached. Another three-cornered instrument, made 

 of split bamboos, is also used for elevating the 

 water of tanks. It is alternately let down and raised 

 full of water by means of ropes attached to it, and 

 held by two men on each side of the gutter ; and 

 by having troughs elevated one above another, 

 water may be raised to any height required. Some- 

 times, particularly from rivers, where the bank is 

 high, water is elevated at once to a considerable 

 height, by means of an instrument called a tera. 

 This is an earthen vessel, tied to a bamboo or 

 pole, which is attached to one end of a beam, consi- 

 derably elevated, to the further end of which a 

 weight of stones or earth is suspended ; several men 

 (about four or five) are required to work this ma- 



