A COMMERCIAL POINT OF VIEW. 



23 



Z), the glass-covered run, should not be less than six 

 feet long, three feet wide, four feet high to the rise, and 

 six feet to the apex on top of the glass frame, which 

 ought to be movable to admit of ventilation. The sides 

 should be formed of whitewashed boards. A perch 

 can also be fixed with advantage in this compartment. 



Fig 7. 



Fig. 8. 



E, the open run, should be not less than twelve feet 

 long, three feet wide, and three feet high. The plan 

 I recommend for the construction of open runs consists 

 of separate wooden frames six feet by three feet (see 

 Fig. 6), on which the wire netting is fixed, and grooved 



Fig. 9. 



uprights, in which these frames are slid. (See Figs. 7, 8.) 

 The frames forming the top can be joined together by 



