.'U'tiial ciiiisiiin])liiii:. If an a(]uarinni is in such a jilacc as tn lii.' aH\'Cte-(l Ijv seasonal ti_-ni]jeraturL' 

 changes, llii- lisli slioulil Ik yiven fond less frequently and in smaller i|uanlit\" during the ciildt-r nionllis. 



I'Vk.hI may Ijc scatlei-ed oxer the surface and allowed to fall In tlie hdttnni, ur it inav he placed in a 

 little tray or di>h suspended a few inches below the surface. The adxantage of the former method is 

 that the fish have to seek their food and take it more slowly; the disadvantage is that the unconsunied 

 ft)o(l is not easily remo\-able and the amount c;m not readily be estimated. The advantage of the latter 

 method is the lish may be more clnsely watcheil wlien feeding, the i)roj)er amnunt of fooil can be 

 more accurately determined, anil the uncimsumcd food is not left to pollute the water and can be easily 

 remo\'ed. 



.\ nicely balanced aquarium recjuires but little attentidU. So long as the water remains ])ure, 

 11(1 change is necessary; some of the most successful a(|uaria go fur sexeral years witlmnl a oinplele 

 renewal of the water; and all that is required is to replace the water lost by e\a[)oration. When 

 water becmnes foul through neglect or ignorance, the fish should Ije renio\-ed to another \essel. the 

 plants thoroughly washeil in running water, and the a(|uarium emptied, cleansed, and filled with ptu'e 

 wafer. When o.N.ygenation is imperfect and the fish are suffering (as shown b\ tlieir restlessness, 

 e\ ident discomfort, labored ix'S])iralioii. ;ind efforts to get air at the surf;ice ), the water may be aerated 

 l)\- dipjiing it up and pouring it back from a height of a foot or more, fiesh water ma\- be introduced, 

 and ;i more adequate ]ilant growth slionld be pnnided. It is necessary to cleanse the sides of the 

 a(|uariuni of algal .and other growths from lime to time, in order to afford a good \ic\v of the lish. 

 .\ccumulations of animal and vegetable waste matter on the bottom must be rcmo\ ed frequentlv — 

 l)referably each day; this is done most conveniently by means of a glass tube about half an inch in 



102 



