152 Lessons in Nature Study. 



Note to Teacher. The snails may be placed in a box of 

 moist earth, rotten wood, and dead leaves, and supplied with 

 a fresh head of lettuce or a leaf of cabbage. The pupils 

 can then observe their ways of life. 



The soft jellylike eggs will soon be seen, and the young 

 snails will appear with their minute shells having i|- whorls. 



The pupils may draw the shell and write the results of 

 their observations illustrated with the drawings. 



Water-snails may also be studied in a jar of water. Their 

 habits will furnish an endless supply of material for observa- 

 tions. 



It is a good plan to make a collection of land and fresh- 

 water shells, placing each kind by itself in a small box. If 

 you do not know the name, label each box with the loca- 

 tion where it was collected. 



Slugs and snails belong to a very large family of animals. 

 We call this family the mollusks. All mollusks have soft 

 bodies, and most of them have shells into which they can 

 crawl. 



THE MILLIPEDE AND CENTIPEDE. 



Here are two curious creatures found under a stone. Let 

 us examine them. We will not touch them, for they are 

 poisonous. Let us see wherein they are alike. 



Both are long and slim. Both have jointed bodies. Both 

 live under stones and in damp places. Both have many 

 legs, and long feelers on their heads. We call them thou- 

 sand-legged worms. Do you suppose that they have so 

 many legs as that ? No, indeed. Which kind has the most 

 legs ? How do they differ in color ? We call the one with 

 the greatest number of legs a millipede, and the other a 

 centipede. The centipede is flat, but the millipede has a 

 round body. The hind legs of the centipede are bent back 

 like two tails. How does the millipede act when I touch 

 him with this pencil ? He rolls up into a ball. Which has 

 longest feelers ? The centipede. Are these feelers com- 

 posed of one piece, or are they jointed ? Which one is most 

 active ? 



