No. 550] 



BREEDING MICE 



51)8 



dirt may collect, and which at the same time will make 

 evident that which has accumulated. Such a case should 

 be made with a perforated bottom and should be pro- 



vided with sides of glass. Briefly described. 2 the case 

 that I have constructed consists of a framework of light 

 wood, a back of galvanized iron and sides, front and par- 



