3 So 



Handbook of Nature-Study 



3. Note the eyes. Are they as large and prominent as those of the 

 bees or butterflies? 



4. Has this cockroach wings? If so, how man}' and what are they 

 Uke? Note two little organs at the end of the body? These are the 

 cerci, like those of the crickets. 



5. Describe the general appearance of the cockroach's legs, and tell 

 what you think about its ability as a runner. 



6. Note how the cockroach cleans itself and how comipletely and care- 

 fully this act is performed. Have you ever seen cockroach's eggs? If so, 

 describe them. 



7. How can you get rid of cockroaches if they invade your kitchen? 



LESSON LXXXIV 



How TO Make an Aquarium 



' HE schoolroom aquarium may be a very simple 

 affair and still be effective. Almost any glass 

 receptacle will do, glass being chosen because of 

 its transparency, so that the life within may be 

 observed. Tumblers, jelly tumblers, fruit jars, 

 butter jars, candy jars and battery jars are all 

 available for aquaria. The tumblers are especially 

 recommended for observing the habits of aquatic 

 insects. 



To make an aquarium: i. Place in the jar a layer of sand an inch 

 or more in depth. 



2. In this sand plant the water plants which you find growing under 

 water in a pond or stream; the plants most available are Water-weed, 

 Bladderwort, Water Starwort, Watercress, Stoneworts, Frog-spittle or 

 Water-silk. 



3. Place on top a layer of small stones or gravel; this is to hold the 

 plants in place. 



4. Tip the jar a little and pour in very gently at one side water taken 

 from a pond or stream. Fill the jar to within two or three inches of 

 the top; if it be a jelly tumbler, fill to within an inch of the top. 



5. Let it settle. 



6. Place it in a window which does not get too direct sunlight. A 

 north window is the best place ; if there is no north window to the school 

 room, place it far enough at one side of some other window so that it will 

 not receive too much sunlight. 



7. To get living creatures for the aquarium use a dip-net, which is 

 made like a shallow, insect net. 



8. Dip deep into the edges of the pond and be sure to bring up some 

 of the leaves and mud, for it is in these that the little Abater animals live. 



g. As fast as dipped up, these should be placed in a pail of water, so 

 that they may be carried to the schoolroom. 



ID. In introducing the water animals into the aquarium -t is well to 

 put but a few in each jar. 



The care of the aquarium — Care should be taken to preserve the plant 

 life in the aquarium, as the plants are necessary to the life of the animals. 

 They not only supply the food, but they give off oxygen which the animals 



