Invertebrates The Terrarium 
caterpillars was first noticed. One little boy at first 
‘announced that the ‘caterpillars were green because 
they were not ripe,’ a good example surely of the 
danger of reasoning from analogy. 
’ Very soon the inhabitants of this terrarium world 
‘began to increase. -A father and two mother grass- 
hoppers and a young one, with his “‘armor on,’’ came 
to. live there; also a “woolly bear,” several other 
‘species of caterpillars, several species of beetles, a big 
horse-fly, some lady-bugs, and a cicada. About this 
time too, some very unwelcome immigrants appeared. 
‘These were the ichneumon flies. So numerous did 
they become in a very short time that they threatened 
desolation to this prosperous community. Nature’s 
methods were then. scrutinized and the services of 
two tree-toads-were: sought. Their response was.. 
immediate and cordial. Soon not an ichneumon fly 
could be found. 
The grasshoppers were partial to celery, over-ripe 
bananas, and moisture. Three days after they 
became inhabitants of this miniature world, the 
mother grasshopper dug a hole in the ground and 
laid eggs. The observing children then had before 
them living illustrations of the three stages of grass- 
hopper life. . 
The tree-toads were both amusing and accommo- 
dating. They, too, -liked the wire netting at the 
ends of the terrarium, and delighted the children by 
climbing up foot over foot, or hand over hand, like 
odd four-handed : sailor © boys. This brought into 
plain view the tiny suckers on their feet. 
After the ichneumon flies had disappeared, a new 
difficulty arose. The. ground became mouldy, and 
the'grass died: down. . The terrarium was then placed 
by an open window and left there several hours for a 
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