136 



FEESH-WATEE AQUAEIA. 



stretched tightly side by side across the top of that part 

 of the tank where the division is desired. If the aquarium 

 is made of slate, the wire is fastened to the iron bolts; 

 if of zinc, through tiny holes made in the framework; if 

 of wood, to four little screw-eyes placed in the cross-bars. 

 Three or more pieces of glass about Sin. wide, the length 

 of which exactly equals the depth of the tank, are out, and 

 one piece is placed between the cross-wires, pressed against 

 the side of the aquarium, and then sunk at the lower 

 end as deeply in the sand and gravel as possible. A short 

 piece of wire is now twisted tightly once round the two 



Fig. 101. Common Perch (Perca flhyiatilis). 



parallel pieces and then pushed quite close to the glass 

 just inserted. The remaining pieces of glass are fixed in 

 the same way untU a partition has been made across the 

 tank. The twisted wires not only keep the portions of the 

 glass division firmly in their places, but the proper distances 

 apart — close enough together to prevent the passage between 

 them of small fish, and wide enough asunder to allow for 

 t\e free circulation of the water. A piece of perforated 

 zinc, cut the right size and fixed in the same manner, is 

 another method of making a partition; but it does not look 

 so neat as the glass, nor is it so wholesome for the fish. 

 These divisions may be made when the tank is full of 

 water and stocked, care |of course being taken that the 



