A SPIDER’S ACTIVITIES. 99 
board or stonc, in almost any field or garden. In 
some localities these animals are called ‘‘ earwigs ’’, in 
other places they arc known as centipedes. Another 
name for the most common species is lithobius. Speci- 
mens may be easily obtained by using tweezers or a 
piece of cloth. They may be kept in alcohol or 
formalin. 
In note-books answer these questions: 
What is the habitat of this animal ? 
Does it prefer light or darkness ? 
Does it prefer moist or dry places ? 
Does it bite or suck its food ? 
In what respects does it resemble the spider? The 
grasshopper ? 
How does it differ from both spider and grasshopper ? 
Does the number of segments correspond with the 
number of legs ? 
The front feet have poison-claws. Do these feet 
have the same shape as the others ? 
Drawing. A sketch of lithobius. 
Questions. 1. How do the breathing-organs of a 
spider differ from those of the insects previously 
studied ? 
2. Do you think the spider’s breathing has any rela- 
tion to his activity ? 
3. Have you noted any protective devices among 
spiders ? 
Topics for Reports. The Cochineal Insect. 
Aphides. Shellac. The Silk-worm. The Manufac- 
ture of Silk Goods. The Caddis-fly. May-flics. The 
Ant-lion. The Noises of Crickets, Mosquitoes, and 
Bees. The Habits of Honey-bees. The Carpenter- 
bee. Agricultural Ants. Mud-wasps. How Flies 
Walk on Ceilings. The Senses of a Fly (experiments). 
The Senses of a Spider (cxpcriments).  Spider- 
webs. Water-spiders. Trap-door Spiders. Scorpions. 
Cheese-mites. Ccntipedes. Thousand-legs. Stings 
and Poisons. The Sense of Sight in Spiders. Where 
