Teachers' Leaflet. 



623 



References for toads, frays and tree toads. — Cornell Nature-Study 

 Volume, "The Life History of tlie Toad," by S. H. Gage ; "The Frog 

 Book," Dickerson; "Familiar Life in Field and Forest," Mathews; 

 "American Natural History," Hornaday; "Elementary Zoology," V. L. 

 Kellogg. 



HOW TO MAKE AN AQUARIUM. 



Purpose. — To teach the pupils to make an aquarium from simple 

 materials at hand. 



Materials. — It is a mistake to think that an aquarium must be an 

 expense aiTair. Almost any glass receptacle will do, glass being chosen 

 because of its transparency, so that the life in the aquarium may be ob- 

 served. Tumblers, jelly tumblers, fruit jars, butter jars, candy jars and 

 battery jars are all available for aquaria. The tumblers are especially 

 recommended where you wish to observe the habits of some aquatic insect 



(i). Place in the jar a layer 

 of sand about an inch or more in 

 depth. 



(2). In this sand plant the 

 water plants which you find grow- 

 ing under water in a pond or 

 stream ; the plants most available 

 are \^'ater-weed, Bladderwort, 

 Water Starwort, Watercress, Stone- 

 worts, Frog-spittle or Water-silk, 

 and a few plants of Duck Weed. 



(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, 

 or rain water. Fill the jar 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 

 schoolroom place it far enough at one side of some other window so that 

 it will not receive too much sunlight. 



(/). To get living creatures for the aquarium use a dip net, which is 

 made like a shallow insect net. 



An aquarium. 



