FEEXS AND AQUAEIA. 
199 
congenial to the Ferns, and so arranged that the 
soil in the apertures left at the top should not 
become soddened by the water beneath, and that 
only the ultimate filaments of the fibrous rootlets 
of the flowerless plants should actually touch the 
water. 
Where space allows, the end of a room lighted 
by a window, or by a skylight (page 200), might be 
transformed into a fernery and aquarium in one. 
'The tank for holding the fish could in such a 
case be placed some three or four feet above the 
ground, water being supplied by a jet connected 
with the main. At the back and at the sides of 
the aquarium virgin cork receptacles may be 
provided for Ferns; or, where the aquarium 
stands close to the end wall of the room, rockery 
may be constructed by the aid of cement. It 
may be built up, in fact, from the floor of the 
tank in such a way that its base may provide 
holes into which the fish may retire, and the 
moisture perpetually rising from the surface of 
the water will be found most congenial to the 
growth of the Ferns in the rockery above. 
Amongst the prettiest contrivances for asso- 
