DE riCES FOR OBSERVATION JX NATURE-STUDY 



137 



furnishes one side of the enclosure. This window can be raised, a 

 moveable screen may be placed in open space, and at all times the 

 children may hear the call or cry the animal is making, and observe 



Window cage as seen from outside tht bulletin; 



what is going on. The three outer sides are made of wire-screening, 

 and above this the cage is glazed to its eaves. The roof is so built 

 as to shed rain. For the purpose of changing the sand or cleaning 

 the cage a zinc tray is fitted to its llcoi. 



In the first picture, two ring denes are the objects of the study. 



