340 THE VIVARIUM. 
bottle, which contains only a wooden ladder and a little water. 
Imprisoning such active animals as Tree-frogs in so small a space 
is, I think, little short of cruelty. Perhaps the most suitable 
place for Tree-frogs while in this country is a greenhouse, where 
they can have liberty. The window-frames of the greenhouse 
should be provided with perforated zinc in such a way that the 
Frogs cannot escape when the windows. are open. If the Frogs 
have access to a large tank of rain-water in which some broad- 
leaved aquatic plants are growing, such as Villarsia (Villarsea 
nymplteoides), the Cape Fragrant Water Lily (Aponogeton 
distachyon), or the broad-leaved pond-weed (Potamogeton nutans), 
some of them would be tempted to breed there, especially the 
beautiful European Tree-frog (H. arborea). Their tadpoles 
should be treated in the same way as has been suggested for those 
of the Common Frog, particular attention being given to regular 
feeding and change of water. The Vivarium in which Tree-frogs 
are confined should be so situated that its Inmates may have 
access to both sunshine and shade. 
The Grasshopper Frog (Acris gryllus) has received its English 
name from its voice, which resembles that of its insect namesake. 
It is a native of North America, being commonest in the Kastern 
and Central parts of that country. It is a dweller among plants, 
particularly aquatic, rather than a frequenter of trees. It is often 
found in stagnant waters. | 
The Grasshopper Frog has an eye with a horizontal pupil, a 
heart-shaped tongue, which is free behind, vomerine teeth, free 
fingers, and toes fully webbed and slightly dilated into small 
disks at the tips, a slender body, narrow head, and sharp snout. 
The skin of the upper part of the animal is either smooth or 
slightly tuberculous, while the under parts are granulated. The 
coloration is very variable, being reddish-brown, brown, or different 
shades of green, and mottled on the back and sides, and striped 
on the legs. There is, however, generally, a three-cornered 
brown spot between the eyes, and sometimes a light vertebral 
line. The male possesses a subgular vocal sac. 4. gryllus when 
full grown is about 13in. from the snout to the vent. 
The Changeable Tree-frog (Hyla versicolor, Fig. 84) is sure to 
become a favourite of those who keep it in their Vivarium, as it 
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