22 



NEW YORK AQUARIUM NATURE SERIES 



COI^RAMI 



Til is t'Xntic si)ecimen lived for several years 

 at the Aquarium. 



trokltishes, may have the tissues of the fins injured by exposure 

 to sudden changes in temperature, rendering them liable to the 

 disease known as "tail-rot." Aquaria should, therefore, be kept 

 out of cold draughts in the winter time and water should be 

 added only when it is at the same temperature as that of the 

 r.(|uarium. 



For tropical fishes which require higher w^ater temperatures 

 the year round, 75 to 80 degrees or more, various devices have 

 been invented. Several of these are quite satisfactory, even with 

 Fniall tanks. When specially constructed tanks or other appa- 

 ratus are required, it will be best to consult a dealer in aquarium 

 supplies in regard to the matter. 



It is possible to heat a tank by means of electric light bulbs 

 placed near the tank, and a little careful experimentation with 

 the aid of the thermometer wall indicate how^ close the bulb 

 should be placed. But the best appliances involve means of cir- 

 culating the water so as to maintain nearly the same tempera- 

 ture in all parts of the aquarium. 



PLACING THE AQUARIUM. 



The aquarium jar or tank should be placed on a firm base 

 where it will not be subjected to much vibration and where it 



