SCHOOL EQUIPMENT AND ITS MANAGEMENT. 335 



The soil may be turned over from time to time and the 

 increase in size of the larvae noted. Here again the 

 structural feature of the three stages should be compared 

 with other types. The adults may appear any time be- 

 tween June and September, depending upon the species, 

 weather, and other circumstances. This study is an im- 

 portant one for a school situated in an agricultural district, 

 since the destructive nature of the crane fly or " daddy- 

 long-legs " is not sufficiently well known (see p. 311). 



Observational beehives or formicaria. These may be 

 obtained from various dealers, and where they can be 

 afforded are most interesting objects of study. 



COLLECTIONS. 



When once the enthusiasm of pupils and teachers has 

 been aroused it will not be found difficult to make a col- 

 lection of natural objects suitable for lesson demonstrations. 

 Such collections will be found useful when weather con- 

 ditions are unfavourable for outdoor work or when fresh 

 lesson materials are scarce. They are of special importance 

 in town schools. As illustrations the following are men- 

 tioned as of value, but of course this is a case where oppor- 

 tunities will largely determine the nature of the collections 

 made. 



Teeth. 



Set of molar teeth (one of each type) of dog or cat, 

 (flesh cutting or bone crushing), horse (grain or herb 

 bruising), ox (herb bruising or teasing), rabbit (herb 

 bruising), pig (omnivorous type), man (omnivorous 

 type). Such a group might profitably be extended to 

 include incisors and canines as well. 



This collection is useful as illustrating the structural 

 adaptations in mammals to different types of diet. 



