THE AQUARIUM BULLETIN 



35 



(3 2 — iSxio) equal 50 degrees 

 Fahrenheit. 

 Example No. 2 



How many degrees of Centigrade 

 are 104 degrees of Fahrenheit? 

 Answer: 



According to formula No. 2 substi- 

 tute 104 for n and we have : 

 5(104—32) 



equal 40 degrees 

 9 

 Centigrade. 



Cuts shown in September issue. 

 Copies of scale, printed on white 

 cardboard may be obtained upon ap- 

 plication at ten cents each, stamps or 

 coin, to cover postage. 



Tubifex 



ITS CARE AND FEEDING 

 By Jos. Froehlich 



Have you ever examined the shores 

 of ponds when collecting daphnia and 

 noticed in places where the water is 

 shallow, in the mud, peculiar sponge- 

 like lumps of a muddy red color pro- 

 truding a little above the bottom? 

 These lumps are clusters of Tubifex 

 and are easily recognized by the 

 incessant squirming and wriggling of 

 thousands of small red worms each 

 about one-half inch long. 



This makes an excellent live food 

 for all kinds of fish, especially gold- 

 fish. In order to collect them it is 

 necessary to dig up some of the mud 

 and carry same along with them. 

 Although the statement has been 

 made that but few fish appear to like 

 it, this that can only be explained by 

 the filthy condition of the water in 

 the ponds where Tubifex is usually 

 found. Tubifex should be of a bright 

 red color similar to fresh beef. 



