344 



Fresh Water Aquarium 



glass tube the shape of which 

 is shown by the illustration. 

 The upper end, that is the one 

 furthest away from the wid- 

 ened part of the lever, is closed 

 with the finger, the lower end 

 is then placed in the refuse 

 corner slightly above the bot- 

 tom of the latter. The finger 

 is then removed and the con- 

 tents of the refuse corner will 

 be sucked up at once. The 

 total length of the mud-lever 

 should surpass the depth of 

 the aquarium by about four 

 or five inches. The bell tube, a straight 

 glass tube with one end widened to a cup or 

 bell shape, can easily be attached to the lever 

 or rubber tubing used for emptying the 

 aquarium and will prevent the sucking up 

 of the sand if placed with the wide end near 

 the aquarium bottom. 



m 



Fig. 128. Mud- 

 lever. 



