Minnow.
This led to a general reconstruction of the aquaria. The perch were taken out and restored to the broad, together with the eel. The roach, bream, and minnows, were put into two of the aquaria by themselves, and the sticklebacks and water-insects into the other. Many a fight took place among the sticklebacks and the water-boatmen, in which sometimes the one and sometimes the other came off victorious.
Smooth Newt.
The boys then got some caddis-worms, pulled them from their cases, and put them into a glass vessel filled with water, and having at the bottom some glass of different colours broken into small pieces. In a short time the caddis-worms had made themselves new, parti-coloured cases of glass, which were quite transparent, and through which the white bodies of the grubs could be plainly seen. Frank put these in among the minnows one day, and it was amusing to see the fish darting at the caddis-worms, thinking they would be soft, succulent morsels, and to watch their evident astonishment at being foiled by the hard cases. This suggested an idea to Frank which he afterwards carried out.
None of the sticklebacks kept by the boys built nests or bred, so that they missed seeing a very pretty and interesting sight. "Fishes building nests!" I hear some of my readers exclaiming. Yes, sticklebacks do build nests, and in the number for January 1866 of Science Gossip is an interesting account of this habit, which I take the liberty of quoting. When I have observed any fact in natural history myself, I describe it in my own words; but when I take it from the observation of others, it is fairer to them to use their own words, and far better in the interests of truth:—
"Two pair of sticklebacks were procured about the middle of April,—the males having already put on their spring dress of scarlet and green, and the females being full of spawn.